Mintlify vs GitBook vs ReadMe: 2026 Comparison

These three reach the same shortlist while answering to three different owners. Mintlify is built for engineers who keep documentation in a repository. GitBook is built for teams where documentation is nobody's engineering job. ReadMe is built around a single API and the developers integrating against it.

The usual framing, docs-as-code against a visual editor, expired a while ago. What separates them now is who may publish, where each one puts its reader-facing AI, and what the bill does when you add a second product.

Every figure below comes from each vendor's latest published pricing page and product documentation. Where we describe how something behaved, that is our own build on all three.

Quick Decision Guide

None of the three is cheaper or better in the abstract. The shortlist usually resolves on three questions: how many people need a login, whether your readers sign in to use your API, and how many products you document separately.

Mintlify may be the better fit when:

• Your editing team is large or growing, since the paid plan includes unlimited seats while the other two bill per head [1] [3] [5]
• Documentation ships through CI and you want broken links and build errors caught before a merge, which the mint CLI does locally [2]
• You want the agent to run on a schedule as well as on code changes, which automations do. ReadMe's GitHub AI Writer drafts from pull requests on Pro, and GitBook has no schedule or merge trigger [2] [4] [6]

GitBook may be the better fit when:

• Writers, support staff, and product managers all edit pages, and the editor has to be one they adopt without training [4]
• You need a reader-facing chat assistant, which GitBook opens a tier earlier than Mintlify and does not sell as an add-on [3] [4]
• You document several products, because site sections collapse them into one subscription instead of multiplying it [3] [4]

ReadMe may be the better fit when:

• Your product is an API and adoption data drives the roadmap, because the Developer Dashboard reports per-key endpoint usage that neither competitor attempts [6]
• Readers need to fire real requests with their own credentials instead of a sample key [6]
• You want AI that inspects documentation rather than writes it, which the Linter and Docs Audit do [6]

Bottom line: GitBook is the cheapest route to a reader assistant at almost any team size, Mintlify the cheapest route to a large editing team, and ReadMe is not really bought on price at all, it is bought on knowing which developer called which endpoint. All three bill per documentation site or project, so price your second product before comparing a single feature. If none of the three billing shapes matches the team you have, Documentation.AI prices the plan rather than the seat, the site, or the answer, which makes it a useful control against three quotes. Our Mintlify vs Documentation.AI, GitBook vs Documentation.AI, and ReadMe vs Documentation.AI comparisons run each against that model. Start free.

How These Platforms Were Compared

We built the same documentation on all three, using one OpenAPI description and one page tree, and compared signup and setup, writing and restructuring a page, the authoring and reader-facing AI, the published reading experience, total cost at the tier a team would actually buy, and what each one does when you reach a limit.

Each section reports what each platform did, then what the difference costs you in practice. For each platform assessed on its own, see our Mintlify review, GitBook review, and ReadMe review.

Which Is Fastest to Set Up: Mintlify, GitBook, or ReadMe?

ReadMe, if your documentation starts from a specification, because the OpenAPI import sits inside signup rather than after it. Mintlify reaches a published site about as quickly from a repository you already have. GitBook asks more questions than either before it builds anything.

Mintlify

Signup runs through Google or email and ends on one fork: point Mintlify at a GitHub repository, or start from a template. We pointed it at an existing repository, and what came back held its structure, with the navigation configured rather than skeletal.

The repository never recedes afterwards. Pages are MDX files, docs.json carries the structure, a new branch opens a draft pull request, and publishing writes a commit. A writer who has never merged anything can still ship a page, but they are inside a Git workflow whether or not they have the vocabulary for it. GitLab works, though you issue a project access token and build the webhook yourself [2]. Nothing expires either: the site you publish while evaluating stays yours on five seats and a custom domain, though the free plan carries no AI beyond a 14-day trial grant [1].

GitBook

Signup offers email, Google, or GitHub, so nobody is pushed through a Git provider. Onboarding then asks a real set of questions about what you are documenting, whether it has to stay private, and what it should connect to, so the setup is more deliberate than the other two and takes longer to reach a URL.

Git Sync stays opt-in, which is the single biggest reason documentation owners outside engineering pick GitBook. A team can run an entire site from the block editor and never connect a repository. Review still borrows Git's shape through change requests, so branches and merges do not disappear so much as get renamed.

The evaluation is where the free plan bites. GitBook Free seats one person and carries no custom domain, so a team cannot assess it together without paying for the privilege [3].

ReadMe

Signup takes Google or email, then asks you to name the documentation, upload a logo, and pick an organization. The OpenAPI import lives inside that flow, which changes the shape of the first hour: link a description and you have an interactive reference with endpoints, parameters, and a working request console before a single guide exists.

GitHub sync comes afterwards and connected quickly, and bi-directional sync then keeps the description and the published reference in step on every plan including the free one [6]. Publishing does something neither competitor does, routing you through the pricing page, because a plan gets selected before documentation goes live. Calling it a paywall would be unfair, since the free plan is one of the options, but a billing screen still sits between a finished draft and a public URL [5].

Seats are the harder constraint. The free plan includes one teammate, so inviting a technical writer into an evaluation means changing plan rather than changing a setting, and the 14-day Pro trial with no card is the only practical way to test collaboration [5] [6].

Verdict: ReadMe gets an API reference live ahead of the other two, Mintlify gets a whole site live just as quickly from a repository you already have, and GitBook is slower and earns some of it back by asking what you are building. Evaluation capacity separates them more usefully than speed: Mintlify seats five people free on a custom domain, ReadMe seats one, and GitBook seats one without a domain at all.

Editing and Restructuring Docs

All three run a visual editor over Markdown or MDX with a source mode underneath, so on a single page there is barely anything left to choose between them. Everything that still separates them happens either side of that page, in the tooling around it and in how hard it turns out to be to leave.

Mintlify

Mintlify gives writers and engineers two different front doors to the same MDX. In the browser, a visual mode hides the syntax, live cursors show who else is in the page, and comments, suggestions, and a diff view make review feel like editing a document rather than filing a pull request. Reordering the site is a drag, not a config edit [2].

From a terminal it looks nothing like that. mint serves the site locally, formats MDX across the tree, fails on a broken link or a build error before a reader meets it, and flags when your checkout has drifted from production [2].

Underneath both doors sits an ordinary MDX file in a repository you already own, and that is what keeps the rest of your tooling working unchanged. Grep it, script a bulk rename, lint it, gate it in CI. It settles the exit question too, since leaving means moving files rather than extracting them.

GitBook

Elements arrive from a toolbar, a slash menu, or drag and drop, and the drag handling is smooth enough that writers stop noticing the tool. Markdown sits underneath, so you can work in the editor, in the repository, or across both.

Editing happens inside change requests, which hands pull-request review to people who have never opened a terminal. That buys real editorial control at the cost of ceremony on small fixes. Real-time collaboration and reusable content both start at Essential, so the single-user free plan gets neither [3]. Scale exposed two rough edges: past 50 or so pages the page tree gets heavy, and after a few dozen uploads there is no good way to find an image again, so people re-upload instead of hunting.

The exit is the real constraint, and it is worth settling before you commit. No export button exists. GitBook's documented route out is to sync a section to an empty repository and treat that repository as the export, and it warns that some blocks have no Markdown representation and come through as HTML [3] [4].

ReadMe

Visual is the default mode, restructuring is straightforward, and a source mode hands you the MDX when you want it. Someone who has never touched Git is not stopped. One quirk to plan around: while somebody edits the raw source, the page turns read-only for every other teammate.

Content types are where ReadMe quietly pulls ahead. Guides, API reference, recipes, a changelog, and discussion forums all sit as first-class types inside one project, and recipes especially have no real counterpart elsewhere here. Reusable content, branching, and reviews all arrive with the paid plan [5] [6]. The project boundary is the constraint: self-serve plans each cover one project, so a second product means a second plan, and putting two products on one domain or searching across them is an Enterprise conversation [5].

Upgrading to ReadMe Refactored cannot be undone, which deserves naming before anyone starts. It drops Suggested Edits, and Enterprise projects also lose Staging and Translations. ReadMe's own wording is that customers relying on any of those should not upgrade [6].

Verdict: GitBook is ahead on the editor for a mixed team, and change requests are the reason, because review without a terminal is a capability rather than a convenience. ReadMe has the richer content model. Mintlify leads on everything around the editor, from the local preview loop to link validation before a merge. Restructuring separates them further: Mintlify's editor agent rewrites navigation and edits docs.json directly, GitBook routes every structural change through a change request somebody merges, and ReadMe reorders freely inside a project and stops dead at its boundary.

So the deciding question is who writes your documentation, and the honest answer is rarely one group. If your team is genuinely mixed, that is the case Documentation.AI was built for: it publishes from a browser for people who will not open a terminal and syncs two ways with GitHub or GitLab for people who live in one, writing to the same source either way. See how setup works.

AI Feature Comparison Across Platforms

Capability is not what separates these three, since all ship a working authoring agent and a working reader-facing assistant. What separates them is which plan opens each one, whether the reader assistant is inside the plan at all, and what happens when readers ask more questions than you paid for. Each has also picked a different job: Mintlify aims it at writing and maintaining the pages, GitBook at drafting pages and answering readers, ReadMe at inspecting what you already published.

They no longer disagree about the machine audience. All three ship llms.txt and an MCP server on every plan, the free ones included, so AI agents answering on your readers' behalf can read the documentation directly.

Mintlify

The assistant runs on your published site, answers by tool calling rather than flat retrieval, links every citation, and reads method, parameter, and schema detail out of your OpenAPI description. Indexing happens on publish, which catches people out before a demo, because draft branches and preview deployments are never indexed and hidden pages stay out unless you change the indexing setting in docs.json [2].

The agent researches, plans, writes, validates against the CLI, then opens a pull request instead of touching your live site, so its worst output costs a review rather than a rollback. Navigation and docs.json both sit within its reach, and the panel still carries a beta label [2]. Automations reach further than anything either competitor runs unprompted: the agent runs on five trigger types, covering content updates, code changes, a schedule, incoming webhooks, and integration events, with the last held for Enterprise, each capped at 500 runs a day [2]. ReadMe's GitHub AI Writer reacts to pull requests and GitBook's Content gaps scan runs daily, but neither lets you set the agent to run on a schedule of your own [4] [6].

Most write-ups of Mintlify credits are out of date, because the rates changed recently. Four actions spend them at fixed rates: an assistant answer at 25, audio narration generated for a page at 50, an automation run that actually changes your documentation at 250, and an Autopilot pull request, still in beta, at 250. Readers trigger the first two. Failed answers, empty runs, and the editor and Slack agents all cost nothing on the paid plan [2].

GitBook

GitBook Agent lives in the editor, and on a scoped single-page change it writes and edits cleanly. It will also review a page for staleness and return the claims it thinks a human should check. The free plan caps it at 10 messages a week, Essential removes the cap, and it is not metered per action at any tier [3] [4].

The Agent also works without a prompt in a few places. Style-guide checks review your spaces against the guide you set and open change requests for what they find. Content gaps, on Ultimate, compares reader questions against the documentation every day and opens a change request for each gap, and a Jira ticket labelled gitbook gets a drafted change request. What GitBook lacks is a schedule or merge trigger you configure yourself [4].

Reader AI splits into two products, and the split is where GitBook's pricing page gets expensive. AI search puts a short generated answer beside keyword results and starts at Essential. GitBook Assistant, the full chat sidebar, is Ultimate only, along with embedding it in your own product and connecting outside knowledge. Those connections are a genuine strength: Zendesk, Intercom, Front, Linear, and Jira all feed the Assistant on Ultimate, where Mintlify holds its integrations back for Enterprise. AI insights, also Ultimate, reports which reader questions went fully, partially, or entirely unanswered, grouped into topics [3] [4].

Reader AI is metered here, whatever gets repeated to the contrary. Each answered question spends 20 credits, from 2,000 a month on an Essential site and 10,000 on an Ultimate site, so about 100 and 500 answers. Past that, a billing setting decides whether AI pauses or keeps running and bills the extra credits on your next invoice, at a per-credit rate GitBook publishes. Give it credit for the half it does not meter: authoring AI is gated by plan rather than counted, so a writer never works against a balance [3] [4].

ReadMe

Ask AI fields reader questions inside the published hub, grounded in your pages and linking back to each source. Pro and Enterprise bundle Ask AI Lite at no extra charge, which puts the assistant on the page and goes no further. Tone, answer length, forbidden topics, model choice, and analytics all sit on the paid add-on, sold against all three tiers rather than bundled into any of them, while the Ask AI API stays on Enterprise [5] [6].

Pay for the full add-on and the analytics is most of what arrives, listing every question asked, the answer given, and a thumbs up or down on each, which amounts to a gap report your readers wrote for you. Either way the logs last 60 days and content re-indexes on a two-hour cycle, so a correction you publish takes a while to reach readers [6]. On the authoring side, the Agent panel now works across the whole site, editing many pages from one prompt, fetching URLs, and changing project settings. The inline Agent is the narrower tool: it works on a selection and shows a diff you accept or reject. Reach is what that design costs: tables are off limits, it cannot generate new MDX components, and a selection caps at 10,000 characters. The free plan gets only a limited number of complimentary agent answers [6]. GitHub AI Writer, on Pro and up, is the one part of ReadMe that acts on a code change: it watches your pull requests and drafts a documentation update when a change affects your docs. Nothing on ReadMe runs on a schedule [6].

An AI editor rather than an AI writer is rare, and the Linter is one. Write your style guide in prose, separated into rules, hard errors, and soft warnings, and it becomes a rubric that scores every page, with a Fix All that passes the work to the Agent. Docs Audit runs the same rules site-wide, though a preview is all the paid plan gets. Odd for a tool built around API documentation, API Reference endpoints are excluded from linting altogether [5] [6].

What Each Plan Actually Buys

Verdict: Automations give Mintlify more autonomy than either competitor, because its agent runs on a schedule, a webhook, or a code change, where ReadMe's GitHub AI Writer reacts to pull requests only and GitBook's unprompted work is limited to checks and scans that open change requests. GitBook is easier to try before paying than the other two, since its authoring agent gets a weekly allowance on the free plan, where ReadMe's free agent stops after a limited number of answers, and its reader assistant arrives a tier earlier than Mintlify's. ReadMe went somewhere else and built a critic: a rubric that scores pages you have already written against a style guide you wrote yourself. GitBook's style-guide checks now cover similar ground, opening change requests where pages drift from the guide.

Access separates them more than capability does, and none of the three lets you live with a reader assistant before paying for it. Mintlify's free plan has no AI, GitBook's carries only the authoring half, and ReadMe's full assistant is an add-on, though its 14-day Pro trial, with no card, lets you try Ask AI Lite first. Judge reader AI from use rather than from a feature table, which is easier when it is not sitting behind a paywall: Documentation.AI puts both the reader assistant and the documentation agent on its free plan, charges 10 credits a question rather than 25, and pauses credits instead of billing an overage, so you can point it at your own pages and read what comes back. Start free or book a demo.

Published Docs: Design, Search and API Reference Depth Compared

All three publish fast, responsive, accessible sites with light and dark modes, working search, and clean SEO output. They disagree on what the site is for. Mintlify treats it as a designed product surface, GitBook as a knowledge base that happens to be public, ReadMe as a console the reader is logged into.

Mintlify

Mintlify's default output needs less work than either rival's, arriving with clean typography, working dark mode, sensible syntax highlighting, and components for tabs, callouts, cards, steps, and code groups already built.

The playground builds itself from OpenAPI 3.0, 3.1 and 3.2, or from AsyncAPI 3.0 for WebSocket channels, and rebuilds whenever the description changes. Authentication fields come from securitySchemes, an x-default extension can prefill test credentials so a reader's first request succeeds rather than returning a 401, and code samples generate in 18 languages [2].

For a hosted platform, customization stays unusually open: custom CSS and JavaScript sit on every plan including the free one, and only white labeling waits for Enterprise [1] [2]. Pages go uncounted, so growing the site never adds a line item. Access control stops at page level, and both preview deployments and password protection wait for the paid plan [1] [2].

GitBook

Pages render as clean responsive layouts, OpenAPI integrations produce interactive API blocks on a Scalar playground, and SEO handling needs no configuration. Specification support reaches back further than either competitor, covering Swagger 2.0 as well as OpenAPI 3.0 and 3.1 [4].

Every plan builds unlimited preview deployments, the free one included, which few competitors match, and a pushed branch gets its preview link posted on the commit status. Versions and translations arrive as free site variants [3]. Search tiers upward rather than sideways: full text is free, generated answers in the search box start at Essential, and the Assistant sidebar is Ultimate, with analytics laddering the same way [3] [4].

The constraints are structural rather than cosmetic. Customization is theme-driven, covering logos, fonts, footer, colors, code themes, and icon styles. You cannot change page layout, and no custom CSS, HTML, or JavaScript can be injected. GitBook's own name stays in the footer on every plan, Enterprise included [4].

ReadMe

The published hub is clean, fast, readable on a phone, and carries light and dark modes with an Ask AI search bar. Design is not ReadMe's strength, and the ceiling moves with your plan: custom CSS and HTML on the paid plan, then custom JavaScript, landing page templates, and removing ReadMe's own logo at Enterprise [5].

ReadMe knows who is reading in a way the other two do not. GitBook has no equivalent, and Mintlify recognizes the reader only on Enterprise, through personalization that pre-fills keys and tailors content, with no per-key request logs at any tier. ReadMe fills a logged-in developer's own API keys into the reference and shows them their own request history on the page, so debugging a failed integration happens inside the documentation rather than in a separate HTTP client. Admins see a My Developers view they can filter by key, email, company, endpoint, method, and status [6].

That capability is an add-on and an engineering project rather than a toggle, billing per volume of API logs and requiring the Personalized Docs Webhook plus the Metrics SDK in your production API [5] [6]. Retention catches teams out: by default every plan retains 24 hours of API request history, Enterprise included, and the 30 days of detailed logs plus a year of request history is precisely what the add-on buys [5].

Verdict: Mintlify is ahead on design quality and anything driven by a specification file, and it is the only one of the three that lets a site match a design system without a contract. GitBook gives away more published features on its free tier, with unlimited previews, versioning, and site variants at no cost, and it is also more locked down than the other two: theme options only, no custom code at any price, and another company's name permanently in your footer. ReadMe pulls clearly ahead on the reference once your readers sign in. When a developer's integration is failing and they need their own keys and their own recent requests in front of them to work out why, ReadMe answers on the page. GitBook cannot, and Mintlify's Enterprise personalization stops at pre-filled keys without the request history.

Search is where GitBook's ladder costs the most. Keyword search is free on all three, generated answers are a paid step on GitBook and ReadMe, and the chat sidebar is the top self-serve tier on two of them and an add-on on the third. If custom CSS and a live preview on every plan are part of what you are buying, Documentation.AI carries both from its free tier, and removing its footer badge is an Enterprise line rather than something no plan sells.

Mintlify vs GitBook vs ReadMe Pricing: How Costs Scale

This section decides most of these evaluations, because the three headline numbers describe three different things. Mintlify's is close to a total. GitBook's is a site fee with a per-login multiplier attached. ReadMe's is a starting point with two add-ons beside it. All figures below are the annual billing rates each vendor publishes.

Mintlify

Starter is free with no time limit and seats five editors on a custom domain, with the browser editor, the API playground, and an MCP server. No AI sits on it, beyond a 14-day trial carrying 5,000 credits [1].

Pro is $450 per site per month with unlimited editor seats and 10,000 credits pooled across your organization, and it holds everything the product is sold on: the assistant, the agent, automations, analytics, and previews [1].

Enterprise is custom, and governance is what it adds, from SSO and role-based access control to audit logs, self-hosting, and migration services [1] [2]. Below it, any editor on Pro can push to production.

Credits top up at $145 for 15,000, $370 for 40,000, or $800 for 90,000, with overage at $0.01 a credit, off by default, and half of anything unused rolling over up to 1.5 times your allowance [1] [2]. Our Mintlify pricing breakdown works through the credit math in full.

GitBook

GitBook multiplies two numbers, and both grow. Free seats one user with no custom domain, which makes it a personal plan, though it still carries unlimited previews, versioning, and the machine-readable layer. Essential is $65 per site per month plus $12 per user, which buys the custom domain, real-time collaboration, reusable content, and generated answers in search. Ultimate is $249 per site per month plus the same $12 per user, and it is where the reader Assistant, AI insights, site sections, and authenticated documentation live [3] [4].

Sites multiply, members are counted once across the organization, and guests and readers cost the same $12 as editors. AI runs on credits pooled across the organization: 2,000 a month per Essential site and 10,000 per Ultimate site, with an answer at 20 credits and translations on Essential at 30 credits per 1,000 words. Ultimate's allowance covers 500 answers a month, and extra credits cost $0.01 each, $0.20 an answer, billed on your next invoice unless you set AI to auto-pause, with a low-balance alert and prepaid packs available [3] [4]. Our GitBook pricing guide works through the site-and-seat arithmetic.

Off the main ladder sits the Community plan. It is free, and it hands non-profits, open source projects, and education groups every Ultimate feature except SAML SSO, the reader Assistant included [4].

ReadMe

Starter is free with one teammate, one project, and one published version, and it is a real plan rather than a preview, carrying an interactive API reference, a custom domain, and bi-directional Git sync [5].

Pro is $250 a month with five teammates, then $20 a month each, still capped at one project. It adds branching and reviews, custom CSS and HTML, the richer content types, the AI Linter, and Ask AI Lite [5].

Enterprise is custom on annual billing only, and governance lives there, from Editor and Viewer roles to multi-project management, SAML, audit logs, and the Ask AI API [5].

Then two add-ons, and price those before committing to anything. Ask AI is $150 a month and sits against all three tiers, so an Enterprise contract does not include it. The Developer Dashboard is $100 a month for 5 million API logs, then $10 per additional million, and it buys the extended retention in the same charge [5] [6]. Add-ons are billed for the whole year upfront, and every teammate on the self-serve plans is a full Admin. Our ReadMe pricing breakdown covers both.

What a Team Actually Pays

Without reader AI the answer is short. Mintlify's free plan covers one site and five editors for nothing, where GitBook stops at a single user with no custom domain and ReadMe at a single teammate. Past five editors Mintlify jumps straight to $450, so GitBook Essential costs least from six logins all the way to 32, and Mintlify's unlimited seats take over from 33.

Add AI for readers and the first thing to settle is which product you mean, because two sit a tier apart. Generated answers beside search results, at five editors, cost $125 on GitBook Essential, with about 100 answers a month included, against $250 on ReadMe Pro and $450 on Mintlify Pro. A full chat sidebar costs $309, $400 and $450. From there the seat count decides it:

The crossover is 17 logins, and it runs between two of the three. Below it GitBook Ultimate is the cheapest way to put an assistant on your documentation, and it includes 500 monthly answers against Mintlify's 400. From 17, Mintlify's unlimited seats lead and keep leading as the team grows.

ReadMe never comes out cheapest, and the arithmetic says it cannot: $249 plus $12 a login stays under $400 plus $20 a login at every headcount. Price ReadMe on the Developer Dashboard instead, which is the capability neither competitor sells at any price.

One more number belongs in the comparison: what a single answer costs. Mintlify's included answers work out to about $1.13 each, with packs that bring that down as volume rises. GitBook's 500 included answers on Ultimate are about $0.50 each before seats, and each answer past the allowance costs $0.20, so GitBook stays cheaper per answer on both sides of its limit. ReadMe's $150 buys an unstated quantity, which undercuts Mintlify's rate past roughly 130 questions a month and GitBook's included rate past 300, if the add-on keeps answering at that volume. Get ReadMe's number in writing before you sign.

Documenting Several Products

All three bill per site or project, so this is where the quotes separate most. Four products, 10 editors, reader assistant on:

Site sections are GitBook's own answer to its per-site fee and the largest single saving in this comparison. What you give up is real: one domain, one set of branding, one set of access rules across all four products. Mintlify pools credits across the organization but bills every deployment as its own subscription, and ReadMe caps self-serve plans at one project, so a second product means a second plan and a second add-on.

Priced all three and still short of a fit?
Documentation.AI bundles four documentation projects into one plan with unlimited editor seats, no page counting, and no overage billing on any tier, with the reader assistant and the documentation agent on the free plan rather than the top one.
Start free or book a demo and bring your existing docs across.

Pros and Cons

Mintlify

Pros

• Output that looks designed with no configuration, and custom CSS and JavaScript on every plan when you want to change it [1] [2]
• Editor seats are unlimited on the paid plan, so headcount growth costs nothing [1]
• A maintained local loop: CLI, preview server, MDX formatting, build errors, and broken-link detection before merge [2]
• Automations on five trigger types, so the merge that invalidated a page can be the event that repairs it [2]
• Published credit rates, packs, and overage off by default, so the AI bill is forecastable, with no page limits of any kind [1] [2]

Cons

• No AI on the free plan, so the capability the product is sold on cannot be tested without a card or a 14-day trial [1]
• Nothing between free and the paid tier, a bigger first step than GitBook's or ReadMe's entry plans ask of you [1]
• The included allowance covers 400 reader answers, so traffic you do not control becomes a monthly capacity question, and a second product means a second subscription [1] [2]
• Role-based access control, audit logs, SSO, PDF export, white labeling, and self-hosting are all Enterprise, and without the first every paid-plan editor can publish live [2]
• OpenAPI 3.0, 3.1 and 3.2 plus AsyncAPI 3.0, with no Swagger 2.0, GraphQL, or SOAP, and GitLab setup is a hand-built webhook [2]

GitBook

Pros

• A block editor over Markdown, with drag-and-drop structure, that mixed teams pick up without training [4]
• Change requests, which hand pull-request review to people who have never opened a terminal [4]
• The cheapest route to a reader chat assistant at any headcount under 17, with 500 answers included [3]
• Site sections, which collapse several products into one subscription instead of multiplying it [3] [4]
• A free plan carrying unlimited preview deployments, versioning, full-text search, and the machine-readable layer, with ISO 27001 and SOC 2 on every plan [3]
• Zendesk, Intercom, Front, Linear, and Jira feeding the Assistant on Ultimate rather than Enterprise, and specification support reaching back to Swagger 2.0 [4]

Cons

• Two multipliers, per site and per login, so a second product costs about what the first one did, and every login bills the same whether that person writes or only comments [3]
• The reader chat assistant is an Ultimate feature and metered on top, at 500 answers a month before per-credit overage or an auto-pause [3] [4]
• No custom CSS, HTML, or JavaScript, no layout control, and a footer link that cannot be removed on any plan, Enterprise included [4]
• No export button. GitBook documents the way out as a Git sync into an empty repository, with custom blocks arriving as HTML [4]
• One user and no custom domain on the free plan, which rules out evaluating it as a team without paying [3]
• No schedule or merge trigger for the Agent, and only the published-site renderer self-hosts, unsupported and GPLv3 [4]

ReadMe

Pros

• An interactive reference that fires real requests with the reader's own credentials rather than a sample key [6]
• Per-key endpoint analytics through the Developer Dashboard, which neither competitor offers at any price [6]
• The OpenAPI import sits inside signup instead of waiting to be configured afterwards [5]
• Recipes, a changelog, and discussion forums all count as first-class content inside one project [5]
• An AI Linter that scores pages against a style guide you write in prose, plus a site-wide Docs Audit [6]
• A free plan that publishes a real site on a custom domain, with bi-directional spec sync on every tier [5] [6]

Cons

• The free plan seats a single teammate, so evaluating together means buying a paid plan first [5]
• The reader assistant is a paid add-on at every tier including Enterprise, and no question volume, cap, or overage rate is published anywhere [5] [6]
• Priced above GitBook for a reader assistant at every headcount, since the site fee and the per-seat rate are both higher [3] [5]
• No role below full Admin until Enterprise, so a reviewer holds the same keys as the domain owner, and one project per plan means a second product is a second subscription [5] [6]
• The upgrade to ReadMe Refactored cannot be reversed, dropping Suggested Edits plus Staging and Translations for Enterprise projects [6]

Mintlify vs GitBook vs ReadMe: Final Comparison

A fourth column changes the shape of that table. Documentation.AI arrived after these three, which mostly meant declining the trades each of them made. The reader assistant and the documentation agent sit on the free plan instead of the top one, and a reader question costs 10 credits rather than 25. Editor seats are unlimited and four documentation projects come inside a single plan, so a second product does not mean a second subscription. Pages are never counted, custom CSS and JavaScript work on every tier, and a live preview comes with every plan. No plan bills an overage either, so when credits run out the AI pauses and your documentation stays published.

Its own gating is narrower but real, and worth knowing before you compare: role-based permissions and migration services arrive on the Pro plan, and removing the footer branding is an Enterprise line. Start free and point it at the docs you already have.

Final Verdict

Three questions settle this, and not one of them is about features: who is allowed to publish, how many of them there are, and whether your readers log in. The decision guide at the top of this page says which platform those answers point to. What follows is what the choice costs you after you have made it.

GitBook asks you to live inside a theme. No custom CSS at any price, its own name permanently in your footer, and no export button when you want out. What you get back is the only one of the three that does not charge you twice for a second product, and the cheapest reader assistant under 17 logins.

Mintlify asks you to start at the top. Nothing sits between the free plan and its only paid tier, the free plan carries no AI to judge it by, a second site is a second subscription, and governance stays behind a sales call. What you get back is unlimited seats, uncounted pages, and the only platform here whose agent runs on a schedule or a webhook as well as on the merge that broke a page.

ReadMe asks you to fund an engineering project. The capability worth buying it for needs the Metrics SDK running in your production API, the assistant is an add-on at every tier including Enterprise, and it costs more than either competitor for reader AI at any headcount. What you get back is documentation that shows each developer their own keys and their own requests, something Mintlify, which recognizes readers only on Enterprise, still does not do.

All three sell you the documentation, then sell you the assistant that reads it. None will let you keep one running for free long enough to learn whether your readers reach for it. All three bill by the site or the project, so the second product costs roughly what the first did. And all three meter the one thing a working documentation site produces more of every quarter, differing only at the wall: Mintlify stops answering unless you pay overage, GitBook pauses or bills per credit depending on a setting, ReadMe has never published a wall to hit. Worth pricing Mintlify alternatives, GitBook alternatives, and ReadMe alternatives against the same requirements first. For any two of the three head to head, see GitBook vs Mintlify, Mintlify vs ReadMe, and ReadMe vs GitBook. Each also has its own comparisons against the rest of the field: Mintlify vs Redocly, Archbee vs Mintlify, Mintlify vs Fern, and Document360 vs Mintlify for Mintlify, Archbee vs GitBook and GitBook vs Document360 for GitBook, and Document360 vs ReadMe for ReadMe.

All three also stop short of the same thing. Drafting was the earlier problem and each of them solved some version of it. Maintenance is the current one, and each holds a fragment: Mintlify fires its agent on schedules and code changes, ReadMe drafts from pull requests and scores existing pages against a style guide you wrote, and GitBook checks pages against a style guide and reports which reader questions went unanswered. GitBook's Content gaps is the piece that carries a reader's failed question back to the page, and it sits on Ultimate, the top self-serve plan.

Documentation.AI puts both ends of that loop on every plan, the free one included: automations fire on the merge that changed the product, and the assistant scores its own answers, so a question your documentation could not handle comes back as a page to write rather than as a support ticket.

Migrating from Mintlify, GitBook, or ReadMe?
Documentation.AI's self-serve migrator runs in Claude Code or Codex and handles all three, along with Document360, Docusaurus, Fern, and any live site. The pages travel and the custom blocks need a look. The real work is rebuilding navigation and preserving your existing URLs, redirects included.
Start free, book a demo, or ask us in the Documentation.AI Slack channel.

Frequently Asked Questions

1. Which Is Cheapest, Mintlify, GitBook, or ReadMe?

Headcount decides it, and the answer changes twice. Without reader AI: Mintlify is free to five editors, GitBook is cheapest from six to 32 logins, and Mintlify takes over from 33 on unlimited seats. With a reader assistant: GitBook is cheapest to 16 logins, Mintlify from 17. ReadMe is not cheapest in either case, and cannot be, since its seat rate and its site fee are both higher than GitBook's [1] [3] [5].

2. Which Platform Should You Pick for API Documentation?

They are strong at different parts of it. ReadMe is built for the integrator, with a reference that fires real requests using the reader's own credentials, their request history on the page, and per-key endpoint analytics. Mintlify generates a polished playground from OpenAPI 3.0, 3.1 and 3.2 and AsyncAPI 3.0, with samples in 18 languages. GitBook reaches back to Swagger 2.0, which Mintlify does not accept. If your readers sign in, ReadMe. Otherwise Mintlify [2] [4] [6].

3. Do Mintlify, GitBook, and ReadMe All Have Free Plans?

All three, and they are not comparable. Mintlify's Starter seats five editors on a custom domain with the playground and an MCP server, and no AI at all. ReadMe's Starter seats one teammate and publishes a real interactive reference on a custom domain with Git sync. GitBook's Free seats one user with no custom domain, though it includes the authoring agent at 10 messages a week. Only Mintlify's lets a team evaluate together without paying [1] [3] [5].

4. How Much Does the Reader-Facing Assistant Cost on Each Platform?

Three different models, which is why the totals are hard to compare. Mintlify bundles it into Pro and meters it per answer, at roughly $1.13 for each of the 400 included. GitBook reserves the sidebar for Ultimate, whose 10,000 monthly credits cover 500 answers at about $0.50 each, then $0.20 an answer past that, while Essential's search-box answers draw on 2,000 credits, about 100 answers. ReadMe does not bundle it at any tier: the full version is a $150 a month add-on you buy alongside your plan, Enterprise included, and Pro carries a Lite version with no customization, analytics, or API [1] [3] [5] [6].

5. Which Is Better for Non-Technical Contributors?

GitBook, on two counts. Git Sync is optional rather than deferred, so a team can run an entire site from the block editor, and change requests give writers pull-request review without a terminal. ReadMe comes second, since its editor opens in visual mode, though everything stops at the project boundary. Mintlify has closed most of the gap with visual mode, live cursors, and drag-and-drop navigation, but the model underneath is still branches, pull requests, and MDX in a repository [2] [4] [6].

6. What Happens When You Run Out of AI Usage?

Three different answers, worth deciding on before you sign. Mintlify switches the assistant off until the balance resets, because overage is off by default, though you can enable it at $0.01 a credit with a spending cap. GitBook either auto-pauses AI when its monthly credits run out or keeps the Assistant running and bills $0.01 a credit, $0.20 an answer, on your next invoice, depending on a billing setting, with a low-balance alert and prepaid credit packs available. ReadMe publishes no allowance at all, which is not the same as unlimited, so ask for the limit in writing [1] [3] [4] [5].

7. Which Platform Handles Documentation for Several Products?

GitBook, by a wide margin, and site sections are the reason: several products collapse into one Ultimate subscription instead of multiplying it, at the cost of sharing one domain, one set of branding, and one set of access rules. Neither competitor has an equivalent. Mintlify bills every deployment separately, and ReadMe caps self-serve plans at one project, so consolidating there means an Enterprise contract. The pricing section prices four products on all three [1] [3] [5].

8. How Hard Is It to Move Off Each Platform?

Mintlify is straightforward, since pages are ordinary MDX in a repository you already control, so leaving is a file move. GitBook is harder than either, because there is no export button and the documented route out is syncing a section to an empty repository, with custom blocks arriving as HTML. ReadMe sits between, with bi-directional Git sync on every plan, though its Refactored upgrade is a one-way door. On all three, the work that takes real time is rebuilding navigation and preserving your existing URLs [2] [4] [6].

Sources

1. Mintlify. "Pricing." Mintlify. https://www.mintlify.com/pricing
2. Mintlify. "Mintlify Docs." Mintlify. https://www.mintlify.com/docs
3. GitBook. "Pricing." GitBook. https://www.gitbook.com/pricing
4. GitBook. "GitBook Docs." GitBook. https://gitbook.com/docs
5. ReadMe. "Pricing." ReadMe. https://readme.com/pricing
6. ReadMe. "ReadMe Docs." ReadMe. https://docs.readme.com/main/docs