Side by side
Karapace vs oasdiff
Both stand on contract testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Choose Karapace if you need a free, self-hosted Kafka schema registry and REST Proxy with Confluent API compatibility. Its schema formats, version checks, and monitoring integrations cover several common registry needs. Review its normalization and schema-reference limits against your requirements before adopting it.
Visit Karapaceoasdiff offers specification comparisons through a CLI, GitHub Action, and browser tool, with review options for teams. Consider the review-link retention period and Pro's price if approval workflows or longer-lived reviews are needed.
Visit oasdiffThe facts
| Karapace | oasdiff | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Self-hosted | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Free or on request | Pro: $100 a month |
| Plans published | 1 | 3 |
| Maker | Not published | Not published |
| Website | karapace.io | oasdiff.com |
| On contract testing tools | #12 of 22 | #8 of 22 |
Karapace: what it does well
- Free and open source, with self-hosted deployment.
- Stores schema versions and checks compatibility.
- Supports Avro, JSON Schema, and Protobuf.
- Implements Confluent Schema Registry and REST Proxy APIs.
- Provides high availability and load balancing across instances.
What to know first
- Requires Python 3.12 or newer.
- Schema normalization is supported only for Protobuf.
- Does not implement every Confluent Schema Registry normalization feature.
- JSON Schema references are unsupported.
oasdiff: what it does well
- Supports OpenAPI 3.0, 3.1, and 3.2.
- Detects 755 distinct API changes.
- Browser comparison needs no installation or sign-up.
- CLI and GitHub Action are Apache 2.0 open source.
- Client-side encryption leaves servers with unreadable ciphertext.
What to know first
- Does not support AsyncAPI.
- Does not support GraphQL.
- Free review links expire after seven days.
- Pro costs $100/month.
Alternatives to Karapace Alternatives to oasdiff The whole list