Fern on Vercel
Fern powers developer documentation and SDK delivery for companies like Webflow and ElevenLabs, serving multi-tenant docs across custom domains from a single Next.js app hosted on Vercel. Midway through a platform migration from the Pages Router to the App Router, the team shifted 65% of the codebase in just seven days, bypassing what would otherwise have been a multi-month engineering effort. As a result, Fern now ships multiple deploys each day, with build times down to five minutes and page load speeds improved by as much as 80%.
- Time to first byte is now 3x faster
- Page load times have dropped by 80%
- The platform handles over 6 million monthly page views from 1 million+ unique visitors
- 65% of the platform moved from Pages Router to App Router within one week
