Our take
Pick Fern if you're on a aPI team who will stay on Docs Free at $0/mo (10 members, 1,000 pages) while they open a first API Reference, then Enterprise custom when they need SSO / multiple docs instances — not a paid Docs middle tile (the page we fetched prints only Free and Enterprise). Pick Theneo if you're on a aPI team who will stay on Starter $0 (1 public + 2 private projects, 20 members) while they publish a
hosted API Reference desk
Best for
Fern An API reference you start at a public $
Theneo AI-written endpoint copy plus a portal, billed per workspace
Free plan
Fern $0 · /mo (Free forever). 10 team members. 1,000 pages. 250 AI credits / month. 2,000 page generations / month. Custom domain and subpath. Guides, API references, changelogs. API explorer and web editor. Ask Fern, Fern Agent, and MCP. Version and product switching
Theneo $0 · 1 public project, up to 2 private, 20 members, 100 AI search results, 2,000 TheneoAI assists. Changelog + API Explorer
Lowest paid
Fern Not published by the vendor
Theneo Business $120/mo yearly
Next step up
Fern
Theneo Growth $400/mo yearly
Coding agent
Fern Ask Fern / MCP
Theneo
Runs where
Fern Hosted
Theneo
Watch out
Fern There is no public Docs Pro $
Theneo Starter AI is capped
Last checked
Fern 2026-10-23 · buildwithfern.com/pricing.md
Theneo 2026-10-28 · theneo.io/pricing
aPI teams who will stay on Docs Free at $0/mo (10 members, 1,000 pages) while they open a first API Reference, then Enterprise custom when they need SSO / multiple docs instances — not a paid Docs middle tile (the page we fetched prints only Free and Enterprise).
Read the Fern pageaPI teams who will stay on Starter $0 (1 public + 2 private projects, 20 members) while they publish a first reference, then buy Business when they need a custom domain.
Read the Theneo page