OpenAPI generator examples:
| OpenAPI Generator | Fern | Hey API | Kiota | |
|---|---|---|---|---|
| Open-source | ✅ OSS | Open-core | ✅ OSS | ✅ OSS |
| Multi-language | ✅ 50+ | ✅ Major | ❌ TS only | ✅ Major |
| Server stubs | ✅ Yes | ❌ No | ❌ No | |
| SDK quality | ✅ High | ✅ High (TS) | ✅ Strongly typed | |
| Production defaults | ✅ Included | ✅ Included | ✅ Included | |
| Docs platform | ✅ Integrated | ❌ No | ||
| Extensibility | ✅ Templates | ✅ TS ecosystem | ||
| Best fit | Broad coverage | API product | TS apps | Large structured APIs |