AxonOps Schema Registry
AxonOps Schema Registry: A free, self-hosted registry with broad schema formats, compatibility modes, and Kafka ecosystem support. Ranked #1 of 25 in Schema Registry Software by our editors (9.4/10); pricing: Free plan; best for teams wanting a free, self-hosted registry.
At a glance
- Editor score9.4 / 10
- PricingFree plan
- Best forTeams wanting a free, self-hosted registry
- Free planYes
- Paid fromFree
- Schema formatsAvro, Protocol Buffers, JSON Schema
- Facts checked20 Sep 2026
Where it wins
- Confluent Schema Registry API compatibility without Kafka-based storage
- Seven compatibility modes across Avro, Protocol Buffers, and JSON Schema
- RBAC, audit logging, metrics, and multiple storage backends included
Where it doesn't
- Deployment is self-hosted rather than managed
- Storage choices require PostgreSQL, MySQL, Cassandra, or in-memory backends
- Its focus is Kafka-compatible event infrastructure rather than general API schemas
Our verdict on AxonOps Schema Registry
AxonOps Schema Registry is an open-source schema registry for teams operating Apache Kafka or Kafka-compatible event infrastructure. It supports Avro, Protocol Buffers, and JSON Schema, while providing Confluent Schema Registry API compatibility. The product covers schema registration, versioning, lookup, deletion, compatibility validation, data contracts, and schema metadata. Its self-hosted deployment model suits teams that want control over infrastructure and storage rather than a managed registry service.
The published product details describe the registry as 100% free and open source, with no premium tiers, under the Apache License 2.0. Deployment targets include Linux, APIs, and self-hosted environments. Storage can use PostgreSQL, MySQL, Apache Cassandra, or in-memory backends, so teams can align the registry with existing infrastructure. Its ecosystem fit is broad for Kafka operations: integrations include Apache Kafka, Docker, Kubernetes, and Prometheus, with Prometheus metrics and health checks available for operational visibility.
Its strongest functional depth is schema governance. Seven compatibility modes—NONE, BACKWARD, BACKWARD_TRANSITIVE, FORWARD, FORWARD_TRANSITIVE, FULL, and FULL_TRANSITIVE—support different evolution policies, with validation performed before registration. Authentication, role-based access control, audit logging, encryption-related APIs, schema analysis endpoints, and a built-in MCP server for AI-assisted schema management extend the registry beyond basic storage and lookup. Choose AxonOps Schema Registry if a free, self-hosted registry with Confluent API compatibility and governance features fits your Kafka environment. Teams seeking a managed deployment or a broader non-event-focused schema platform should look elsewhere.
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AxonOps Schema Registry pricing
AxonOps Schema Registry fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Schema formats | Avro, Protocol Buffers, JSON Schema |
| Compatibility modes | NONE, BACKWARD, BACKWARD_TRANSITIVE, FORWARD, FORWARD_TRANSITIVE, FULL, FULL_TRANSITIVE |
| Validation scope | Event |
| Deployment options | Self_hosted |
| Approval workflows | Not verified |
| Git synchronization | Not verified |
| Deployment | Self-hosted |
| Platforms | Linux |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: Apache Kafka, PostgreSQL, MySQL, Apache Cassandra, Docker, Kubernetes … |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
AxonOps Schema Registry integrations
AxonOps Schema Registry lists 7 integrations on its own site.
- Apache Kafka
- PostgreSQL
- MySQL
- Apache Cassandra
- Docker
- Kubernetes
- Prometheus
Alternatives to AxonOps Schema Registry
- AWS Glue Schema RegistryA free AWS-native registry for schema control across major streaming services.9.3
- Apicurio RegistryBroad open-source registry coverage for teams managing APIs, events, and data contracts.9.2
- Dataphos Schema RegistryAn open-source registry for validating and routing events across multiple brokers.8.9
See all AxonOps Schema Registry alternatives →
AxonOps Schema Registry vs the competition
- AxonOps Schema Registry vs AWS Glue Schema Registry
- AxonOps Schema Registry vs Apicurio Registry
- AxonOps Schema Registry vs Dataphos Schema Registry
- AxonOps Schema Registry vs Karapace
- AxonOps Schema Registry vs Buf Schema Registry
- AxonOps Schema Registry vs Yandex Cloud Schema Registry
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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