Fern
AcquiredInstantly offer SDKs and API Docs
About
APIs underpin the internet but are still painful to work with. They are often untyped, unstandardized, and out-of-sync across multiple sources of truth. Fern helps companies deliver SDKs and API documentation that they’re are proud to share with their customers. Since launching in 2023, we’ve been trusted by over 200 customers, including industry leaders like Square, Webflow, ElevenLabs, Auth0, and Intercom, to power their developer and agent experiences. We’re fewer than 40 people, based in Brooklyn, NY, and are building open source.
Founders
Danny Sheridan· FounderFrom Cleveland. Built Fern in NYC. Living in the Hill Country outside of Austin.
Zach Kirsch· FounderHey! I'm one of the builders of Fern, where we're making it easier to build APIs. Before Fern, I worked at Palantir as a software engineer.
Deep Singhvi· FounderDeep is a YAML engineer at Fern. Before Fern, he worked as a software engineer at Palantir focusing on data integration at the Department of Defense and US Army.
Product launches · 2 launches
Build a "Stripe-level" docs website powered by OpenAPI
Auto-generate your client libraries, API reference, and server code
Change history · 20 recorded
- August 23, 2026
- YC partner updated08:01 PM
- Launches refreshed08:01 PM
- New founder joined: Danny Sheridan, Zach Kirsch08:01 PM
- August 9, 2026
- Launches refreshed08:01 PM
- Founder profile updated08:01 PM
- YC partner updated08:01 PM
- July 26, 2026
- Founder profile updated08:01 PM
- Launches refreshed08:01 PM
- YC partner updated08:01 PM
- July 12, 2026
- Launches refreshed08:01 PM
- Relocated to New York City08:01 PM
- YC partner updated08:01 PM
- Founder departed: Danny Sheridan08:01 PM
- July 9, 2026
- Location updated07:00 PM
- June 28, 2026
- Launches refreshed08:00 PM
- Founder profile updated08:00 PM
- YC partner updated08:00 PM
- June 14, 2026
- Founder profile updated08:00 PM
- Launches refreshed08:00 PM
- YC partner updated08:00 PM