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AxonOps Schema Registry
London, United Kingdom
What it is
AxonOps Schema Registry manages schemas used with Apache Kafka as an API-compatible replacement for Confluent Schema Registry. It supports Avro, Protobuf, and JSON Schema, with schema references and seven compatibility modes. Schema data can live in PostgreSQL, MySQL, or Cassandra, so Kafka is not needed as the storage backend. The project says existing Confluent serializers and Java, Go, and Python Kafka clients can connect by using the registry URL. Security options include Basic Auth, API keys, JWT, LDAP/AD, OIDC, mTLS, four RBAC roles, rate limiting, and TLS certificate auto-reload. Audit events can be routed to stdout, rotating files, syslog, or webhooks in JSON or CEF format. Client-side field encryption includes a DEK/KEK registry and integrations with HashiCorp Vault and OpenBao Transit. Data contracts add tags and domain, migration, and encoding rules. Its beta MCP server supports AI clients including Claude, Cursor, VS Code Copilot, and Windsurf. This free, Apache 2.0-licensed software runs as a Docker container or can be built from source; Cassandra storage requires version 5.0 or later.
For and against
For
- Supports Avro, Protobuf, and JSON Schema.
- Stores schemas in PostgreSQL, MySQL, or Cassandra.
- Existing Kafka clients can use the registry URL.
- Free, open source, and available as a Docker container.
Against
- Cassandra storage requires Cassandra 5.0 or later.
- The built-in MCP server is marked beta.
- The AI client integrations are described as beta-server support.
The verdict
AxonOps Schema Registry combines schema management with several storage, security, audit, and encryption options. Check the Cassandra version requirement and beta status of its MCP server when evaluating fit.
Who it suits
It suits teams managing Kafka schemas that want multiple schema formats, configurable storage, and built-in security options. It can also suit teams that need data contracts or client-side field encryption.
Plans and prices
Free
all features · no premium tiers · no license keys
Read 15 Oct 2026 · github.com
AxonOps Schema Registry
No hidden costs · no premium tiers · no license keys
Read 30 Sep 2026 · github.com
On the record
- AI integration
- Its built-in MCP server is marked beta and supports AI clients including Claude, Cursor, VS Code Copilot, and Windsurf.github.com · read 30 Sep 2026
- API compatibility
- The registry implements the Confluent Schema Registry REST API v1, including enterprise endpoints.github.com · read 15 Oct 2026
- API documentation
- A built-in Swagger interface is available at the /docs endpoint.github.com · read 15 Oct 2026
- Audit logging
- Audit events can be sent to stdout, rotating files, syslog, and webhooks in JSON or CEF formats.github.com · read 15 Oct 2026
- Authentication
- Built-in authentication methods include Basic, API keys, JWT, LDAP/Active Directory, OIDC, and mutual TLS.github.com · read 15 Oct 2026
- Business activities
- Companies House lists software publishing and information-technology consultancy and service activities for AxonOps Limited.find-and-update.company-information.service.gov.uk · read 15 Oct 2026
- Client compatibility
- The maker says existing Confluent serializers and Java, Go, and Python Kafka clients work by pointing them at the registry URL.github.com · read 30 Sep 2026
- Client libraries
- Existing Confluent serializers for Java, Go, and Python can work by changing the registry URL.github.com · read 15 Oct 2026
- Company founded
- LinkedIn gives AxonOps a 2022 founding year.uk.linkedin.com · read 15 Oct 2026
- Company headquarters
- LinkedIn identifies AxonOps headquarters as London, United Kingdom.uk.linkedin.com · read 15 Oct 2026
- Company size
- LinkedIn lists AxonOps as having 11–50 employees and 13 discoverable employees.uk.linkedin.com · read 15 Oct 2026
- Compatibility modes
- The product supports seven compatibility modes, including backward, forward, full, and transitive variants.github.com · read 15 Oct 2026
- Data contracts
- Data contracts attach metadata tags and domain, migration, and encoding rules to schemas, with defaults and per-subject overrides.github.com · read 30 Sep 2026
- Deployment
- The registry is a single statically linked binary of about 50 MB and can run as a Docker container or be built from source.github.com · read 30 Sep 2026
- Deployment footprint
- The project describes a statically linked binary of about 50 MB with no runtime dependencies.github.com · read 15 Oct 2026
- Developer prerequisites
- The development guide lists Go 1.26 or newer and Docker, with Java 17+, Maven, and Python 3 optional for compatibility tests.github.com · read 15 Oct 2026
- Documentation depth
- Documentation covers installation, configuration, storage, schema types, compatibility, security, auditing, deployment, monitoring, migration, encryption, exporters, MCP, and troubleshooting.github.com · read 15 Oct 2026
- Encryption
- A DEK and KEK registry provides client-side field-level encryption compatible with Confluent serializers.github.com · read 15 Oct 2026
