Your documentation site comes with automatic optimizations for AI tools, plus features you can install to help users find answers and keep your content up to date.
AI features are usage-based and consume credits. Every plan includes a monthly credit allowance: Hobby plans get 250 credits, Pro plans get 1,000 credits, and Enterprise plans get a custom amount.
Help users get instant, cited answers from your documentation wherever they’re working. Ask Fern is available as an embedded chat widget, an API for custom integrations, and a Slack app for your community. For developers in AI clients like Claude Code, Cursor, and Windsurf, Fern also hosts an MCP server so they can query your docs directly from their development environment.
AI helps keep your documentation current. Fern Writer is a Slack-based technical writing agent that creates pull requests with targeted edits when you tag @Fern Writer to request updates. For API Reference docs, Fern automatically generates realistic examples from your OpenAPI spec that stay synchronized with spec changes, replacing placeholder values like "string" with believable data.
Your site is automatically optimized for AI tools and search engines. Fern hosts llms.txt and llms-full.txt files so LLMs can index your documentation efficiently, serves Markdown instead of HTML to AI agents, and exposes a standards-based API catalog for automated discovery. These features reduce token consumption and help agents process your content faster.