Upgrade your developer and agent experience
Docs, SDKs, and a CLI for your API. Built for the AI era.
Set up Fern with your agentSet up Fern with your agent
Docs your developers and agents actually use, with search, MCP server, llms.txt, and AI search baked in.
Docs, SDKs, and CLIDocs, SDKs, and CLI
from one source of truthfrom one source of truth
Support modern API protocols: REST, WebSockets, and GraphQL.
Docs
Beautiful, customizable documentation websites.
SDKs
Client libraries designed by language experts.
CLI
Interact with your API from the terminal.
Designed for the AI eraDesigned for the AI era
Integrate AI into how you write, maintain, and consume docs.
1instances:2- url: docs.example.com3navigation:4- section: Get started5contents:6- page: Introduction7- page: Quickstart
1:root {2--color-bg: #FAFAFA;3--color-text: #1F1F1F;4--color-accent: #5B5BD6;5--radius: 8px;6--font-sans: Inter, sans-serif;7}
1---2title: Quickstart3description: Get started in 3 steps4hidden: false5---67Follow the tutorial below to get started with our platform.
Docs as code
Manage your documentation like the rest of your codebase. Version changes in Git, review with pull requests, and use any coding agent to write and update content.
AI chat in docs
Built-in AI chat lets users ask questions and get answers grounded in your docs, with no hallucinations or generic responses.
llms.txt
Your docs ship as clean Markdown with an auto-generated llms.txt, so every LLM and agent can read them.
MCP server
Expose your docs and API through an MCP server so AI tools can query and execute in real time.
AI-assisted authoring
Tag Fern Agent to draft updates, open GitHub PRs, and keep your documentation in sync with what your team ships.
Migrate to the enterprise platformMigrate to the enterprise platform
Teams come to Fern from every kind of stack. Our team handles the heavy lifting, so you ship faster than you did before.
Migrated to run Docs and SDKs without dedicated engineering headcount.
Migrated to aggregate dozens of GitHub repos into one docs site.
Ships first-class WebSocket SDKs alongside REST from one spec.
Enterprise-ready by defaultEnterprise-ready by default
Security, deployment, and partnership that scale with your API.
Security & access control
Gate your docs so customers see only the content relevant to them. Connect any SAML or OIDC provider and lock pages down by role, team, or plan.
Multi-source docs
Aggregate content from multiple repos into one site, with product and version switching that scales across teams without breaking IA.
Self-host
Run on our managed cloud, or self-host to meet stricter security, networking, and compliance requirements.
Localization
First-class translated content. Ship docs in multiple languages as part of the rollout, not as a bolt-on.
Compliance
SOC 2 Type II and annual pentests. Reports and supporting security documentation available for procurement.
Support & SLAs
Uptime SLA, escalation paths, and a dedicated Slack or Teams channel, with 24/7 coverage for critical incidents.
Native Postman support
Generate and publish Postman collections from the same source of truth as your Docs and SDKs. Keep your approved Postman workflows, without duplicate specs or manual upkeep.
Hear it from our customersHear it from our customers
Fern has 8,000+ customers across Docs, SDKs, and CLI.
“I used to work at Stripe, where they built their own SDK auto-generation in house. I know how much effort goes into it. It's one of those things that I'm very happy to buy, not build.”
“Adding a feature used to mean implementing it seven times, once per language. Now we change the spec once and it ships in every SDK, so we scale features as fast as we can define them.”
Field notes from the Fern teamField notes from the Fern team
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Elevate your developer experienceElevate your developer experience
Generate beautiful Docs, idiomatic SDKs, and an agent-first CLI from your API spec. One source of truth, everything in sync.