AI Developer Documentation Platforms Comparison 2026: Mintlify, GitBook, ReadMe and 7 More (Pricing & Free Plans)

Choosing an AI developer documentation platform is harder than it looks. Vendors bundle AI features differently, and some charge by credits or tokens instead of a flat fee. Free plans, trials, and Japanese-language support also vary a lot from tool to tool.

This article compares 10 platforms: Mintlify, GitBook, ReadMe, Document360, Fern, Redocly, Archbee, Theneo, Scalar, and Bump.sh. For each one, we cover pricing, free plans, Japanese support, supported platforms, strengths, and weaknesses. We compared them using each vendor's official website, checked in November 2026.

After the tool-by-tool sections, you will find recommendations by goal, tips for choosing without regrets, and a short FAQ. Prices can change, so check the official website for the latest pricing and features before you decide.

What Are AI Developer Documentation Platforms? What They Do and What to Know Before Choosing

AI developer documentation platforms help teams build, publish, and maintain documentation for APIs and developer products. Most start from Markdown files or API definitions such as OpenAPI. On top of that, they add AI features for readers, writers, and AI tools.

Typical uses include the following:

• Reader-facing AI search or chat: answers questions from public documentation and shows source links. Examples include Mintlify's Assistant and Fern's Ask Fern.
• AI-assisted writing and editing: drafts or edits pages from prompts, API specifications, or pull requests. Examples include ReadMe Agent and Document360's AI writing agent.
• Update suggestions from code changes: checks pull requests and proposes documentation updates. Mintlify's Autopilot and Theneo Agent (beta) work this way.
• MCP servers and llms.txt: lets AI tools such as Claude and Cursor read your documentation and API details directly.
• AI translation: creates translated versions of pages and adds a language switcher, as GitBook and Theneo do.
• Usage analytics: shows which questions readers ask, so you can find gaps in the documentation.

Before choosing, check what the free plan or trial actually covers. Mintlify, GitBook, Fern, Scalar, and Theneo offer free plans, while Redocly, Archbee, and Document360 do not list one on their pricing pages. Trial lengths also differ, from 7 days to 30 days. AI features are often limited to paid plans, so confirm which tier includes the ones you need.

Japanese support is another key difference. Several tools list Japanese as a translation or localization language, but most official websites are in English only. Scalar's built-in locales do not include Japanese, and Bump.sh does not state its Japanese support. Whether an AI assistant answers in Japanese is often not officially stated, so test it yourself.

Pricing models and company size also matter. Some plans are flat-rate by project or site, such as Redocly. Others charge by editor, such as Archbee, or by AI credits, such as Mintlify and Scalar. Document360 uses custom quotes. Small teams may prefer published prices and free tiers. Larger organizations should check where SSO, localization, and self-hosting appear, because these are often Enterprise-only. Finally, compare platforms and integrations, such as GitHub, GitLab, Slack, CLI, and MCP support. Check the official website for the latest pricing and features.

Comparison Table of Top 10 Tools (Pricing, Japanese Support, Platforms)

Tool	Main plans	Japanese support	Platforms
Mintlify	Starter $0/month / Pro $450/month or $540/month	Partial	Web, CLI, REST API, MCP server and more
GitBook	Free $0/site/month / Essential $65, Ultimate $249 per site/month (billed annually)	Partial	Web, GitHub integration (Git Sync), GitLab integration (Git Sync), API and more
ReadMe	Starter $0/month / Pro $250/month (billed annually) / Ask AI add-on $150/month	Partial	Web, API, CLI, MCP server and more
Document360	Contact sales	Partial	Web, API, CLI (CI/CD integration), MCP server and more
Fern	Docs Free $0/month	Partial	Web (dashboard), CLI, GitHub integration, Slack integration and more
Redocly	30-day free trial / Pro $249/month, Scale $729/month (billed annually)	Partial	Web (Reunite), CLI (Redocly CLI), GitHub integration, GitLab integration and more
Archbee	14-day free trial / Growing $80/month / Scaling $350/month	Partial	Web, macOS, Windows, Linux and more
Theneo	Business $120/month/workspace / Growth $400/month/workspace	Partial	Web, CLI, SDK, VS Code extension and more
Scalar	Free $0 / Pro $150/month / Business $600/month / Additional SDKs: $150/month for up to 100 endpoints	Not supported	Web, macOS, Windows, Linux and more
Bump.sh	Basic $50/month / Pro $120/month	Not stated	Web, CLI, API, GitHub Actions and more

AIpedia has not rated these tools, because they do not have their own pages on AIpedia yet. Pricing and plans change; we checked each vendor's official website in November 2026. Check the latest information on the official website before you sign up.

Features, Pricing, and Best For: 10 Tools

1. Mintlify

Mintlify builds and hosts developer documentation sites from Markdown and MDX files in a Git repository. The official documentation calls it an "AI-native documentation platform for developers." Pro and above add a reader-facing Assistant, a writing agent, and Autopilot, which proposes updates when code changes.

• Strengths: Even the free Starter plan includes a custom domain, search, an MCP server, and an API playground. You can start with 5 editors.
• Strengths: Content is stored in Git as Markdown and MDX, so you can take your files and history with you when moving to another platform.
• Strengths: Pro is a flat-rate plan with unlimited editors, and the credit price per AI action is published. Autopilot and the writing agent can reduce the effort of updating documentation.
• Things to note: Starter does not include AI features such as the reader-facing assistant, and credits cannot be purchased. Pro costs $450/month even when billed annually, a large gap from the free Starter.
• Things to note: Assistant answers and Autopilot updates consume credits, so additional costs may apply depending on usage. The official website and dashboard have no Japanese version, and Japanese answers from the AI assistant are not officially stated.

Pricing: Starter is $0/month (5 editor seats, custom domain, web editor, authentication, MCP server, API playground; AI features are not included). Pro is $450/month (billed annually) or $540/month (billed monthly), with unlimited editors and 10,000 credits per month. Overage is $0.01/credit. Add-on packs are 15,000 credits for $145, 40,000 credits for $370, and 90,000 credits for $800 per month. Enterprise is contact sales (custom credits, SSO, SCIM, RBAC, self-hosting, EU hosting). New accounts get Pro free for 14 days with 5,000 credits and no card required. An assistant answer costs 25 credits, and an update by Autopilot costs 250 credits. A free Pro plan for open source projects and a 50% discount for 12 months for startups are available by application. Prices are as of November 7, 2026.

Best for: Teams that keep documentation in Git, want to start free, and can work with an English-language interface. Budget for Pro and for credit usage if you plan to use the AI features heavily.

2. GitBook

GitBook delivers product and API documentation written in a block-based visual editor as a published site. It supports Git Sync with GitHub and GitLab. All plans include an API reference that updates automatically from OpenAPI and an interactive API playground.

• Strengths: Even the free plan includes an MCP server, llms.txt, an API playground, and preview deployments.
• Strengths: Billing is not based on page views or number of readers. The structure is per site plus per editing user, and readers of a published site are not billed.
• Strengths: AI credit rates are published (20 credits per question, 30 credits per 1,000 words of translation). AI translation and language switching let you combine a multilingual site into one.
• Things to note: AI Assistant Chat, AI insights, and channel integration are limited to Ultimate ($249/site/month billed annually) and above. A per-user fee for editing users also applies, so costs can grow with a large team.
• Things to note: The pricing page shows only annually billed prices, so check the official documentation for monthly prices. The page describes what happens when AI credits run out in two ways: "automatic stop" and "additional charge at $0.01/credit." Japanese display of the dashboard has not been confirmed.

Pricing: Free is $0/site/month (1 user). Essential is $65/site/month (billed annually; according to the official documentation, $79 billed monthly) and includes 2,000 AI credits per month. Ultimate is $249/site/month (billed annually; $299 billed monthly) and includes 10,000 AI credits per month. Collaborating users add $12/user/month (billed annually; $15 billed monthly). Enterprise is contact sales. Monthly AI credit packs are 5,000 = $47.50, 10,000 = $90, 15,000 = $127.50, and 40,000 = $300, and overage is $0.01/credit. Paid features have a 14-day free trial. A free Community plan is available for nonprofits, open source, and education by application. Prices are as of November 7, 2026.

Best for: Teams that want a visual editor with Git sync and a price model that does not depend on reader traffic. Estimate the per-user fees and AI credit needs before you commit.

3. ReadMe

ReadMe generates interactive API references from OpenAPI specifications. It publishes them as a developer hub with guides, changelogs, recipes, and a discussion forum. It supports two-way sync with GitHub, GitLab, and Bitbucket.

• Strengths: Even the free Starter plan includes a custom domain, two-way Git sync, interactive API references, and an MCP server.
• Strengths: Pro bundles ReadMe Agent, AI Linter, AI Writer, and Ask AI Lite as AI features.
• Strengths: The Developer Dashboard ingests API logs, so you can review API usage alongside documentation. AI Translations (Enterprise) supports 11 languages including Japanese.
• Things to note: Full-featured Ask AI costs an extra $150/month, and the Ask AI API is limited to Enterprise. AI Translations, SAML, audit logs, and multi-project management are also Enterprise-only.
• Things to note: The pricing page shows only annual billing for Pro, so the monthly amount cannot be confirmed. Pro is limited to 5 admins, and additional admins cost $20 each. The official website and help are in English.

Pricing: Starter is $0/month (1 project, 1 public version, 1 admin, 7 days of documentation metrics). Pro is $250/month (shown as "Billed annually," with 5 admins; additional admins are $20 each, no period stated). Enterprise is contact sales (billed annually only, unlimited seats, multiple projects). Full-featured Ask AI is an add-on at $150/month. The Developer Dashboard is $100/month for up to 5 million logs, then $10 per additional 1 million logs. All Pro features can be tried free for 14 days. Pro also comes with 4,000 credits for the new service Restless. Prices are as of November 7, 2026.

Best for: Teams that want an API-focused developer hub with usage analytics. On Starter or Pro, Japanese versions would rely on options such as the Localize integration. Enterprise is needed for built-in AI Translations.

4. Document360

Document360 is knowledge base software for external help centers, internal knowledge bases, SOPs, and API documentation on one platform. Its AI features are grouped as "Eddy AI." Fixed plans are not published, and pricing is a custom quote.

• Strengths: You can run a help center, internal knowledge, and API documentation on one platform. The API documentation imports OpenAPI 2.0 to 3.2 and Postman Collections, with a Try It! console.
• Strengths: Eddy AI covers AI writing from prompts and recordings, reader-facing AI search, and an AI Chatbot add-on. Knowledge base multilingualization and the AI search widget support Japanese.
• Strengths: According to the pricing FAQ, all customers get a dedicated success manager, onboarding, and training. It is compliant with SOC 2 Type II, ISO 27001, and GDPR.
• Things to note: Fixed prices are not published, so you cannot know the cost until you get a quote. The pricing page does not mention a free plan or free trial.
• Things to note: AI Chatbot and AI Premium Suite are add-ons at extra cost. AI translation uses a character-based credit system, and credits renew only once a year. The official website has no Japanese version.

Pricing: Contact sales. No fixed prices are listed on the official pricing page. According to the FAQ, quotes are based on six factors: the number of team accounts (editors and reviewers), the number of workspaces, the number of languages, security requirements such as SSO, whether the knowledge base is public or private, and AI Premium Suite usage volume. AI Chatbot and AI Premium Suite (screen capture, step-by-step guides, interactive demos, video recording) are add-ons. Translate with Eddy AI uses a character-based credit system (1 credit per character, renewed once a year per project). Information is as of November 7, 2026.

Best for: Organizations that need a help center, internal knowledge base, and API documentation together, and are comfortable with a quote-based purchase. Confirm Japanese display needs with the vendor first.

5. Fern

Fern generates developer documentation sites and client SDKs from API definitions such as OpenAPI. According to the official blog, it announced on January 8, 2026 that it was joining Postman. It says it will continue to operate as an independent product.

• Strengths: Even the free plan gives you access to Ask Fern (AI search), Fern Agent, an MCP server, and custom domains.
• Strengths: Documentation and SDKs can be generated from the same API definition, which makes it easier to keep them in sync.
• Strengths: It supports a wide range of specifications and protocols, including OpenAPI, AsyncAPI, gRPC, GraphQL, and OpenRPC. AI credit consumption rates are published in the official documentation.
• Things to note: The only paid plan is Enterprise, and its price is not published. If you exceed the free allowance (250 credits/month, 1,000 pages), you need to contact them.
• Things to note: Localization is Enterprise-only, and the translated text must be provided by the user. Custom CSS, JavaScript, React components, and multi-repository integration are also Enterprise-only. Fern Agent is described as a beta.

Pricing: Docs Free is $0/month (no time limit, 10 team members, 1,000 pages, 250 AI credits/month, 2,000 page generations/month, 1 site, custom domain and subpath). Docs Enterprise is contact sales (SSO, SCIM, localization, custom CSS/JS, self-hosting, and more). SDKs Free is $0 (Python, TypeScript). SDKs Enterprise is contact sales (per SDK, billed annually). Postman paid plan customers can apply to use Postman Team (2,500 pages, 5,000 page generations/month, 25 members). AI credit use: Ask Fern 2 credits per message, AI-generated API example 1 credit, documentation update in Slack 50 credits per session. Prices are as of November 7, 2026.

Best for: Teams that want documentation and SDKs from one API definition and want to start on a free plan. Plan for an Enterprise conversation if you need localization or exceed the free allowance.

6. Redocly

Redocly builds API references and documentation sites from OpenAPI, GraphQL, and AsyncAPI descriptions. It also offers the open-source Redoc and Redocly CLI. Guides are written in Markdown, Markdoc, and React, and every pull request can be previewed.

• Strengths: Plans are flat-rate, with unlimited editors, readers, Git contributors, and pages. Costs are unlikely to change as headcount grows.
• Strengths: The AI Assistant, the MCP server for documentation, and Redocly Agent's pull request review have no extra charge during the beta.
• Strengths: Localization is available on all plans, and Japanese is included in the built-in UI translations. You can start the 30-day free trial without registering a card.
• Things to note: There is no free plan, and even the cheapest Pro is $249/month billed annually ($2,988 per year). The AI features are in beta, and usage-based billing is planned after general availability.
• Things to note: SSO, multi-product sites, and the embedded AI widget are Scale and above. The monthly billing amount cannot be confirmed in the static display of the pricing page. Documentation body translation must be provided by the user.

Pricing: Pro is $249/month (billed annually, $2,988 per year, 3 projects). Scale is $729/month (billed annually, $8,748 per year, 10 projects, SSO, RBAC). Enterprise is contact sales (annual contract, unlimited projects). Additional projects are $39/month or $390/year. Monthly billing is also available, but the amount could not be confirmed. There is a 30-day free trial with no card required. Prices exclude tax. AI features are not billed during the beta and have usage limits. Usage-based billing is planned to start at general availability, announced at least 60 days in advance. Prices are as of November 7, 2026.

Best for: Teams that want predictable flat pricing without per-seat charges and have budget for a paid plan. It is also a fit if you want built-in Japanese UI translations.

7. Archbee

Archbee is a documentation platform for product documentation, developer documentation, user guides, and internal knowledge, published as a "knowledge portal." Growing and above support API documentation, GitHub integration, custom domains, and password protection. Readers are unlimited, and the billable unit is the editing team members.

• Strengths: With annual billing, you can start from $80/month including 5 team members.
• Strengths: The price of the AI add-on, the monthly token amount, and the overage rate are clearly stated on the pricing page.
• Strengths: The MCP server and llms.txt for the public portal are included at no extra charge. Japanese is among the localization languages on Scaling and above.
• Things to note: There is no free plan, and a paid plan is required after the 14-day trial. AI features such as Ask AI are a separately priced add-on on Growing and Scaling.
• Things to note: AI translations are Enterprise-only, and localization is Scaling and above. API and CMS MCP, Q&A, analytics, PDF export, and others are add-ons at $80/month each (billed annually). The official website is in English.

Pricing: Growing is $80/month (billed annually; $100/month billed monthly) and includes 5 team members. Additional members are $5/month ($6 billed monthly). Scaling is $350/month (billed annually; $400/month billed monthly) and includes 5 members. Additional members are $10/month ($12 billed monthly). Enterprise is contact sales (all add-ons included). The AI add-on is Growing $16/month ($20 billed monthly) and Scaling $40/month ($50 billed monthly), and is included in Enterprise. Monthly tokens are 20 million for Growing, 40 million for Scaling, and 100 million for Enterprise. Overage is $1.2 per 1 million tokens. The Public API & CMS MCP add-on is $80/month ($100 billed monthly). There is a 14-day free trial. Open source is free on Growing, and nonprofit and education get a 50% discount. Startups get a 50% discount for 2 years. Prices are as of November 7, 2026.

Best for: Small teams that want a published knowledge portal with clear per-member pricing and are fine paying for AI as an add-on.

8. Theneo

Theneo creates API references, user guides, changelogs, and developer portals from API specifications. The official website says it has generated documentation with its own AI since 2022. It supports REST, AsyncAPI, SOAP, GraphQL, and gRPC.

• Strengths: You can try AI search and AI-assisted documentation creation on the free Starter plan.
• Strengths: Both annual and monthly prices are clearly stated on the pricing page. A wide range of API formats is supported.
• Strengths: Japanese can be selected as an AI translation target language. You can also create authenticated private portals for each customer.
• Things to note: Starter has limits of up to 100 GPT search results for readers and up to 2,000 TheneoAI assists. Custom CSS and AI assistant prompt settings are Growth ($400/month billed annually) and above.
• Things to note: Localization must be enabled for each workspace, and the pricing page does not state the scope offered by plan. Theneo Agent is in beta. The official website is in English.

Pricing: Starter is free (1 public project, 2 private, 20 team members, up to 100 GPT search results for readers, up to 2,000 TheneoAI API documentation creation assists, up to 2,000 API endpoints). Business is $120/month/workspace (billed annually; $150/month billed monthly) with 7 projects, 50 members, unlimited searchAI and TheneoAI, and a custom domain. Growth is $400/month/workspace (billed annually; $450/month billed monthly) with custom CSS, AI assistant prompt settings, and 20 developer portals. Enterprise is contact sales (self-hosting, SAML SSO, OAuth 2.0). Prices are as of November 7, 2026.

Best for: Teams that want to test AI documentation on a free plan and need support for several API formats. Confirm the Japanese localization setting with Theneo before relying on it.

9. Scalar

Scalar generates an API reference, SDKs, and a hosted MCP server from a single OpenAPI document. It also offers a developer portal with Markdown and MDX guides and an open-source (MIT) API client. AI features run on Agent Scalar credits that vary by plan.

• Strengths: You can start with a free plan. Paid plans are flat-rate with editor seats included and published prices.
• Strengths: You can go from documentation to SDKs to an MCP server using a single OpenAPI document.
• Strengths: The API client is open source (MIT) with a desktop app. Credit conversion rules and the overage rate are published in the official documentation.
• Things to note: There is no Japanese in the built-in UI locales, though you can add your own language by overriding labels. The official website is in English.
• Things to note: The hosted MCP server, custom domains, Git Sync, and Markdown/MDX are Pro and above. Only one SDK is included, and extra SDKs cost more. On Free and the trial, chat and API MCP use stops at the credit limit.

Pricing: Free is $0 (3 APIs, 1 SDK up to 25 endpoints, 1 editor seat, 50 Agent Scalar credits/month). Pro is $150/month ($125/month billed annually = $1,500/year) with 15 APIs, 5 editor seats, 1 SDK up to 100 endpoints, 500 credits/month, and a hosted MCP server. Business is $600/month ($500/month billed annually = $6,000/year) with 25 APIs, 10 editor seats, SSO, and 2,000 credits/month. Enterprise is contact sales. Additional SDKs are $150/month for up to 100 endpoints and $600/month for 101–250 endpoints. Credit overage on paid plans is $0.057/credit. New teams can try the equivalent of Pro for 7 days, and a paid plan is required to publish a Docs site after the trial. Prices are as of November 7, 2026.

Best for: Teams that want docs, SDKs, and an MCP server from one OpenAPI document and can work without built-in Japanese locales.

10. Bump.sh

Bump.sh publishes API documentation portals from OpenAPI (2.0 to 3.2) and AsyncAPI (up to 2.6) definitions. It detects breaking changes at each release and creates changelogs automatically. In March 2026, it added an MCP platform that builds MCP servers from Arazzo or Flower workflows.

• Strengths: You can manage API documentation and MCP servers for AI agents with the same specification and release process.
• Strengths: Prices are published starting at $50/month, and Pro can be tried free for 14 days. Human support is available on all plans, according to the pricing page.
• Strengths: MCP server credentials are stored server-side and designed not to be passed to the LLM.
• Things to note: No information about Japanese support or multilingual capabilities was found. According to the official FAQ, GraphQL, gRPC, and SOAP are not supported.
• Things to note: The API explorer, branch management, and automatic changelog are Pro and above. SSO, embedded mode, and custom CSS/JavaScript are limited to the Custom plan.

Pricing: Basic is $50/month (10 API docs, 5 MCP tools, 3 internal users, 20 external guests). Pro is $120/month (30 API docs, 50 MCP tools, 5 internal users, 40 guests, branch management, API explorer, automatic changelog, private MCP servers) with a 14-day free trial. Custom is contact sales (SSO, embedded mode, on-premises MCP runtime, 99.99% SLA). The pricing page does not state a billing cycle. According to the official help, monthly and annual billing are supported, and payment is by credit card only. Open-source projects can use Pro for free by applying. Prices are as of November 7, 2026.

Best for: Teams that want to keep API docs and MCP servers on one release process. Contact the vendor first if you plan to operate in Japanese.

Recommendations by Goal

Goal	Recommended	Why
Start with a free plan that includes AI	Fern, GitBook	Fern's Docs Free plan includes Ask Fern and Fern Agent, and GitBook's free plan includes an MCP server and llms.txt.
Try a paid plan before buying	Redocly, Mintlify	Redocly offers a 30-day free trial with no card, and Mintlify gives new accounts Pro free for 14 days.
Japanese-language use	Redocly, Document360	Redocly's built-in UI translations include Japanese, and Document360's translation and AI search widget support Japanese.
Small team on a low entry price	Bump.sh, Archbee	Bump.sh Basic is $50/month, and Archbee Growing starts at $80/month billed annually with 5 team members.
Enterprise scale and security	Redocly, Mintlify	Redocly Scale includes SSO, and Mintlify Enterprise lists SSO, SCIM, RBAC, and self-hosting.
Documentation and SDKs from one API definition	Fern, Scalar	Both generate documentation and SDKs from API definitions such as OpenAPI.
MCP servers for AI agents	Bump.sh, Scalar	Bump.sh builds MCP servers from Arazzo or Flower workflows, and Scalar generates a hosted MCP server from OpenAPI.
Help center plus API documentation	Document360	It covers external help centers, internal knowledge bases, and API documentation on one platform.

Japanese support is partial for most tools, so test your real use case during a trial. Check the official website for the latest pricing and features.

How to Choose Without Regrets

Start with the pricing model

The tools charge in different ways, so the same team can see very different costs. Redocly and Scalar use flat plans without per-seat billing for readers, while Archbee bills for the team members who edit. GitBook charges per site plus per collaborating user. Document360 gives custom quotes only, so you cannot know the cost until you ask.

Also check how AI usage is billed. Mintlify and Scalar use credits, and GitBook uses AI credits with packs. Archbee sells an AI add-on with a monthly token amount. Redocly's AI features are not billed during the beta, but usage-based billing is planned later.

Check what the free plan or trial really includes

Free plans exist at Mintlify, GitBook, ReadMe, Fern, Scalar, and Theneo, but their limits differ. Mintlify's Starter has no reader-facing AI assistant. Fern's free plan allows 250 AI credits per month. Theneo's Starter caps reader GPT search results at 100.

Redocly, Archbee, and Bump.sh offer trials rather than free plans. Redocly's trial is 30 days, Archbee's is 14 days, and Bump.sh lets you try Pro free for 14 days. Scalar's 7-day trial requires a paid plan to publish a Docs site afterward.

Confirm Japanese support early

Japanese support is partial for most of these tools, and it varies by plan. ReadMe's AI Translations is Enterprise-only, and Fern's localization is Enterprise-only. Redocly includes localization on all plans, but you must provide the body translation yourself. Archbee supports Japanese in localization on Scaling and above.

Scalar has no Japanese in its built-in locales, and Bump.sh does not state its Japanese support. Almost all official websites are in English. If Japanese readers are your main audience, test the AI assistant with real questions before you commit.

Match the tool to your team size and governance needs

Small teams can start with published prices, such as Bump.sh at $50/month or Archbee from $80/month billed annually. Larger organizations often need SSO, SCIM, audit logs, or self-hosting. These commonly sit in Enterprise or higher tiers, such as Scale and above at Redocly and Business at Scalar. Check the plan table for each feature you require.

Look at platforms and your existing workflow

Consider where your content lives and which tools your team uses. Mintlify keeps content in Git as Markdown and MDX. Fern and Scalar can generate SDKs from an API definition, and Bump.sh focuses on changelogs and MCP servers. Document360 suits teams that also need a help center and internal knowledge base. Check Git provider support, Slack, CLI, and MCP availability before you decide. Check the official website for the latest pricing and features.

FAQ

Q. Which tools offer a free plan?

A. Mintlify (Starter, $0/month), GitBook (Free, $0), ReadMe (Starter, $0/month), Fern (Docs Free, $0/month), Theneo (Starter, free), and Scalar (Free, $0) have free plans. Redocly and Archbee have no free plan, but offer trials of 30 days and 14 days. Document360 does not mention a free plan or trial on its pricing page.

Q. Which tools have the lowest published starting prices for paid plans?

A. Among the published paid prices, Bump.sh Basic is $50/month and GitBook Essential is $65/site/month billed annually. Archbee Growing is $80/month billed annually. Features and limits differ, so compare the plan details too.

Q. Which tools support Japanese?

A. Most are partial. Redocly includes Japanese in its built-in UI translations, and Document360 supports Japanese in translation and its AI search widget. GitBook, Theneo, and Mintlify offer Japanese as a translation or language option. Scalar has no Japanese in its built-in locales, and Bump.sh does not state it.

Q. Are the AI features included in the price?

A. It depends on the tool. Redocly's AI features are not billed during the beta. Archbee sells AI as an add-on at $16/month for Growing and $40/month for Scaling, billed annually. Mintlify Pro includes 10,000 credits per month, with overage at $0.01/credit. ReadMe's full-featured Ask AI is an add-on at $150/month.

Q. Which tools suit large organizations?

A. Mintlify Enterprise lists SSO, SCIM, RBAC, and self-hosting. Redocly Scale includes SSO, and Scalar Business includes SSO. Document360 is quote-based and lists SOC 2 Type II, ISO 27001, and GDPR compliance. Confirm requirements with each vendor.

Summary

These 10 platforms differ most in pricing model, free plan coverage, and Japanese support. Some offer free plans with AI features, such as Fern and GitBook. Others, such as Redocly and Archbee, require a paid plan after a trial.

Japanese support is partial for most tools, and the official websites are mostly in English. Test your real use case during a trial and check the official website for the latest pricing and features.

• Want to start free with AI → Fern (Docs Free includes Ask Fern and Fern Agent)
• Want flat pricing without per-seat charges → Redocly (unlimited editors, readers, and pages)
• Need a help center and API docs together → Document360 (one platform, quote-based pricing)

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