Best API Documentation Tools · FREE
Best free API Documentation Tools (2026)
7 api documentation tools that offer a genuine free plan, ranked by entry price. Every figure links to the vendor's own page and the date we captured it.
Key takeaways
- Cheapest: Apidog at $0/mo.
- Qualifying: Apidog, GitBook, Mintlify, ReadMe, Scalar, Stoplight, Theneo.
- Data current through: 2026-06-15.
Comparison
| # | API Documentation Tool | Entry price | Free | HIPAA | SOC 2 | Best for | Source |
|---|---|---|---|---|---|---|---|
| 1 | Apidog | $0/mo | Yes | — | Yes | API-design | apidog.com |
| 2 | GitBook | $0/mo | Yes | — | Yes | knowledge-base | gitbook.com |
| 3 | Mintlify | $0/mo | Yes | — | Yes | developer-documentation | mintlify.com |
| 4 | ReadMe | $0/mo | Yes | — | Yes | developer-portals | readme.com |
| 5 | Scalar | $0/mo | Yes | — | Yes | open-source-API-docs | scalar.com |
| 6 | Stoplight | $0/mo | Yes | — | — | API-design | stoplight.io |
| 7 | Theneo | $0/mo | Yes | — | Yes | AI-assisted-API-docs | theneo.io |