Apicurio Registry
Apicurio Registry: A broad, open-source registry for teams managing diverse API and schema contracts. Ranked #18 of 22 in Contract Testing Tools by our editors (7.4/10); pricing: Open source; best for teams managing many API schema formats.
At a glance
- Editor score7.4 / 10
- PricingOpen source
- Best forTeams managing many API schema formats
- Paid fromFree
- Contract registryYes
- Facts checked20 Sep 2026
Where it wins
- Supports OpenAPI, AsyncAPI, GraphQL, Avro, Protobuf, and JSON Schema
- Applies validity, compatibility, and integrity rules to evolving content
- Connects with Kafka, Kubernetes, OpenShift, PostgreSQL, and Keycloak
Where it doesn't
- Self-hosted deployment leaves infrastructure operations to the team
- Its primary focus is registry management, not full provider verification
- Runtime validation centers on Kafka serializers and deserializers
Our verdict on Apicurio Registry
Apicurio Registry is an open-source runtime registry for storing, versioning, managing, and sharing API designs, event schemas, and data contracts. It is suited to teams coordinating contracts across multiple formats, including OpenAPI, AsyncAPI, GraphQL, Apache Avro, Google Protobuf, JSON Schema, Kafka Connect, WSDL, XML Schema, and ODCS v3.1. A web console supports browsing, searching, editing, and downloading artifacts, while the REST API, CLI, Maven plugin, and language SDKs support developer workflows.
Its strongest fit is a mixed API and event-driven ecosystem. Apicurio Registry integrates with Apache Kafka and Kafka Connect, supports the Confluent Schema Registry API, and can run with Kubernetes or OpenShift. PostgreSQL and Apache Kafka are available as storage backends, while Keycloak is among the supported integrations. Validity, compatibility, and integrity rules help govern content evolution, and consumer verification is supported. Kafka serializers and deserializers extend validation into runtime message handling.
The product offers broad registry and contract-management coverage, but teams should distinguish that from complete provider verification. Its published capabilities emphasize storing and governing artifacts, managing versions, and enforcing evolution rules rather than covering every aspect of provider-side contract testing. Self-hosted deployment also means the team must operate the registry and its selected storage environment. Choose Apicurio Registry when format breadth, open-source deployment, Kafka support, and centralized schema governance matter. Consider an alternative when the primary requirement is a fully managed service or deeper end-to-end provider verification.
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Apicurio Registry pricing
Apicurio Registry fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Contract formats | OpenAPI, AsyncAPI, GraphQL, Apache Avro, Google Protobuf, JSON Schema, Kafka Connect, WSDL, XML Schema, ODCS v3.1 |
| Consumer verification | Yes |
| Provider verification | Not verified |
| Contract registry | Yes |
| AsyncAPI support | Yes |
| GraphQL support | Yes |
| Self-hosted deployment | Yes |
| Deployment | Self-hosted |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: Apache Kafka, Kafka Connect, Confluent Schema Registry API, Kubernetes, OpenShift, Keycloak … |
| Pricing | Open source |
| Website | apicur.io |
| Facts checked | 20 Sep 2026 |
Apicurio Registry integrations
Apicurio Registry lists 7 integrations on its own site.
- Apache Kafka
- Kafka Connect
- Confluent Schema Registry API
- Kubernetes
- OpenShift
- Keycloak
- PostgreSQL
Alternatives to Apicurio Registry
- PactA broad open-source toolkit for consumer-driven contracts across HTTP and message integrations.9.4
- MicrocksA broad contract-testing choice for APIs, microservices, and event-driven systems.9.2
- PactFlowPactFlow brings Pact, OpenAPI testing, contract management, and deployment checks together.9.0
See all Apicurio Registry alternatives →
Also Ranked In
Apicurio Registry is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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