GitBook is a documentation and knowledge platform for publishing product docs that work for both people and AI. Writers use a block-based visual editor, sync content with GitHub or GitLab, and branch, review and merge docs like code. An AI Assistant answers user questions from the docs, AI insights show where readers get stuck, and an agent flags stale content. A Free plan exists, Premium costs $65 per site per month and Ultimate $249 when billed annually.
GitBook suits product teams, developer relations groups, technical writers and support leaders who maintain public or internal documentation. Individuals can start on the Free plan, while teams add collaborators at $12 per user per month. Premium covers public branded docs sites with custom domains, analytics and AI search. Ultimate adds the AI Assistant, insights, GitBook Agent and adaptive content for centralized docs. Enterprises get SOC 2, ISO 27001, SAML SSO, access controls and white-glove migration. Support teams can reduce repetitive tickets by letting customers query the docs, while documentation leads use insights to prioritize fixes.
Typical uses include an API reference with interactive playgrounds, a developer portal that combines several products in sections and groups, and a help center where customers ask questions in natural language. Teams connect Slack, Linear and GitHub so the Assistant and Agent work inside their workflow. Fintech company bunq uses it for its public API documentation. A GitBook MCP server lets AI coding tools read the docs, and a 14-day free trial is offered on paid plans.
