Consolidate your API tech stack
One platform for Docs, SDKs, and CLIs. Replace three vendor contracts with a single source of truth, used by ElevenLabs, Adobe, and Deepgram.
Shipping docs & SDKs with Fern
- 3-in-1Docs, SDKs, and CLIs
- 9SDK languages
Three contracts become one
Most API teams pay for a docs platform, an SDK generator, and a reference portal, then spend engineering time keeping them in sync. Fern is one platform that ships all three from the same spec.
Docs platform
Replace Mintlify, ReadMe, GitBook, or Redocly. Versioned docs with API reference, guides, search, and AI chat built in.
SDK generator
Replace Stainless, Speakeasy, or OpenAPI Generator. 9+ languages from one spec, with publishing to npm, PyPI, and Maven automated in CI.
Reference and playground
Replace Scalar, Swagger UI, or hand-rolled portals. Interactive reference and an API playground from the same spec that drives your SDKs.
Why teams consolidate on Fern
One spec, every surface
Docs, SDKs, reference, and playground all generate from the same OpenAPI source. No drift between code snippets and client libraries, ever.
Ship in one PR, not three
Spec change opens a PR with updated docs, SDKs, and reference together. One review, one release, zero coordination meetings.
9+ SDK languages, multi-protocol
TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, and Rust, generated from the same spec. REST, WebSockets, and gRPC out of the box.
Agent-ready docs out of the box
Auto-generated llms.txt, clean Markdown endpoints, an MCP server, and Ask Fern. Coding agents get accurate context for free.
We evaluated several SDK generators and Fern stood out for its clean, language-native, and thoughtfully architected code. The Fern team partnered with us every step of the way including OpenAPI improvements, alpha releases and launch announcements.
John FellmanHead of Engineering, Developer Platform, Square
See it in production
Each of these teams used to run multiple API tooling vendors. Today they ship from one Fern pipeline.
ElevenLabs consolidated Docs and SDKs onto Fern so every audio model launch ships with reference and clients on day one.
Read case study
Frame.io (Adobe) replaced two vendors with Fern and ships its developer docs and TypeScript and Python SDKs from one pipeline.
Read case study
Deepgram unified REST and WebSocket docs plus TypeScript and Python SDKs on Fern, cutting doc PR turnaround from 30 to 60 minutes down to 5.
Read case study
Cohere publishes docs and generates SDKs in four languages from Fern, replacing the clients it used to maintain by hand.
Read case study
AssemblyAI publishes its speech-to-text docs and generates SDKs from Fern, keeping reference and clients aligned across languages.
Webflow ships its Data API docs and its TypeScript and Python SDKs from Fern, so reference and clients track the API together.
What you get back
Fewer vendors, fewer release coordination meetings, and an API surface that stays in lockstep across every channel.
One source of truth
Docs, SDKs, and reference generate from the same spec, so a breaking change can't make it to production with stale clients or docs.
Faster, fewer releases
Ship the API, docs, and SDKs in one PR. Cut the manual coordination tax between platform, docs, and DX teams.
One contract, one vendor
Stop renewing three SaaS contracts. One procurement cycle, one security review, one SOC 2 Type II vendor across the API surface.
Common questions from teams consolidating
Want the full feature-by-feature comparison? Read Stainless vs GitBook vs Speakeasy.
One vendor for your API surface
A Fern engineer walks you through your current stack, what to consolidate first, and the cutover plan. No sales pitch, no slide deck.
Book a demo