API Contract Tester vs Karapace
| API Contract Tester | Karapace | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Web | api, self-hosted |
| Free plan | Yes | Yes |
| Paid from | 19 /mo | — |
| Contract formats | TypeScript, OpenAPI, JSON | Avro, JSON Schema, Protobuf |
| Self-hosted deployment | Yes | Yes |
| Consumer verification | — | No |
| Provider verification | — | No |
| Contract registry | — | Yes |
| AsyncAPI support | — | No |
| GraphQL support | — | No |
Both are listed in Best Contract Testing Tools. On The Geeks Club, Karapace scores higher on our published basis.