# How Fern runs multi-tenant docs for Webflow and ElevenLabs on Vercel

By Steven Van · 2026-06-09

Fern moved 65% of its docs platform from Pages Router to App Router in seven days, cutting page load times by up to 80%.

Fern, which builds developer documentation and SDKs, runs customer docs for Webflow, ElevenLabs and other companies across custom domains from a single Next.js app on [Vercel](<https://creatorstoolbox.com/tools/vercel>). Partway through migrating the platform from the Pages Router to the App Router, Fern's team moved 65% of it in seven days rather than taking on a months-long engineering project, as described in the [case study](<https://vercel.com/blog/how-fern-runs-multi-tenant-docs-for-webflow-and-elevenlabs-on-vercel>).

- Time to first byte is 3x faster

- Page load times are cut by up to 80%

- The platform serves 6 million+ page views a month from 1 million+ unique visitors

- Deploys now take five minutes and go out multiple times a day

[![](<https://assets.vercel.com/image/upload/contentful/image/e5382hct74si/3UK2upQq1C3nKUck4CiPen/1c0b633e707064c20dbb4680f4a38af2/customer_fern_og_card.jpg>)](<https://vercel.com/blog/how-fern-runs-multi-tenant-docs-for-webflow-and-elevenlabs-on-vercel>)

![Vercel](<https://www.google.com/s2/favicons?domain=vercel.com&sz=128>)

Vercel

The platform for frontend developers — deploy, preview, and scale web apps and AI agents with zero config.

[View Vercel →](<https://creatorstoolbox.com/tools/vercel>)

Sources

[Original source](<https://vercel.com/blog/how-fern-runs-multi-tenant-docs-for-webflow-and-elevenlabs-on-vercel>)

[Read How Fern runs multi-tenant docs for Webflow and ElevenLabs on Vercel on Creators Toolbox](<https://creatorstoolbox.com/blog/vercel-how-fern-runs-multi-tenant-docs-for-webflow-and-elevenlabs-on-vercel>)

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Canonical source: https://creatorstoolbox.com/blog/vercel-how-fern-runs-multi-tenant-docs-for-webflow-and-elevenlabs-on-vercel