No. 5 of 24 ·Schema Registry Software

AxonOps Schema Registry

Linux · Self-hosted · API

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

AxonOps Schema Registry is ranked #5 of 24 in schema registry software on Freedom251. It runs on API, Linux, Self-hosted. There is a free plan.

AxonOps Schema Registry plans and pricing

All plans

AxonOps Schema Registry Free 100% free and open source; Apache 2.0 licensed No hidden costs · no premium tiers · no license keys github.com · 30 Sept 2026

Compared on schema registry software

Free plan: Yes
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

Best AxonOps Schema Registry alternatives

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Two bars Apache Pulsar Free tier No. 1Free6.5 One bar Confluent Cloud Free tier No. 2$385/mo6.5 One bar TIBCO Messaging Schema Repository for Apache Kafka Free tier No. 3Free6.5 One bar AWS Glue Schema Registry Free tier No. 4Free6.4 One bar Buf Schema Registry Free tier No. 6$0.50/mo6.4 One bar Google Cloud Pub/Sub Free tier No. 7$40/mo6.4

The record

Purpose: AxonOps Schema Registry is an API-compatible replacement for Confluent Schema Registry for managing schemas used with Apache Kafka.
Storage: It can store schemas in PostgreSQL, MySQL, or Cassandra and does not require Kafka as its storage backend.
Client compatibility: The maker says existing Confluent serializers and Java, Go, and Python Kafka clients work by pointing them at the registry URL.
Security: Built-in security includes Basic Auth, API keys, JWT, LDAP/AD, OIDC, mTLS, four RBAC roles, rate limiting, and TLS certificate auto-reload.
Audit logging: Audit events can be sent to stdout, rotating files, syslog over TCP/TLS, or webhooks, in JSON or CEF format.
Field encryption: Client-side field encryption includes a DEK/KEK registry and production-ready integrations with HashiCorp Vault and OpenBao Transit.
Data contracts: Data contracts attach metadata tags and domain, migration, and encoding rules to schemas, with defaults and per-subject overrides.
AI integration: Its built-in MCP server is marked beta and supports AI clients including Claude, Cursor, VS Code Copilot, and Windsurf.
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.
Notable limit: The Cassandra storage backend requires Cassandra 5.0 or later; earlier versions are unsupported.
Support: The project README says commercial support plans are offered by AxonOps; it also welcomes community issues and contributions.
Maker: The project identifies AxonOps as its maker and links to the AxonOps website.
Headquarters: London, United Kingdom
Price from: Free

Where it ranks on Freedom251

Best Schema Registry Software in 2026#5 of 24

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Sources

github.com/axonops/axonops-schema-registry· checked 30 Sept 2026