GitBook

GitBook is a documentation and knowledge base platform that lets product, engineering and support teams write, review and publish docs in one place. It positions itself as "the knowledge layer for AI": content lives in a collaborative block editor, can sync two-way with GitHub or GitLab, and is published as a fast, branded site for customers or as a private internal handbook.

The AI layer includes GitBook Agent for drafting and maintaining pages, an embedded AI Assistant that answers reader questions with citations, AI Insights that show what readers search for and where docs fall short, and an MCP server so external AI tools can query published content. Change requests give docs a pull-request style review flow, while custom domains, authenticated access, SAML SSO, SOC 2 and ISO 27001 cover the governance side.

It suits SaaS companies, developer-tool vendors and internal platform teams that want a polished public help center or developer portal without running their own static site, and teams migrating away from wiki tools that were never designed for customer-facing docs.

GitBook prices per published site plus per user. The Free plan costs $0 and covers one user, unlimited traffic and basic publishing, but it excludes custom domains and the reader-facing AI Assistant, and GitBook Agent usage is capped at roughly 10 messages a week. Paid plans include a 14-day trial.

Essential is listed at $65 per site per month plus $12 per user per month and includes 2,000 AI credits. Ultimate is $249 per site per month plus $12 per user per month with 10,000 AI credits and the advanced access and customization options. Annual billing is advertised as two months free.

Enterprise is custom-priced and adds SAML SSO, advanced security and compliance, dedicated support and tailored limits. Prices change often, so confirm the current figures on gitbook.com/pricing before budgeting.