AxonOps Schema Registry vs TIBCO Messaging Schema Repository for Apache Kafka

AxonOps Schema Registry is a free, Apache 2.0-licensed service for managing Apache Kafka schemas as an API-compatible replacement for Confluent Schema Registry. It handles Avro, Protobuf, and JSON Schema, including references and seven compatibility modes. Schemas can be stored in PostgreSQL, MySQL, or Cassandra, without requiring Kafka as the storage backend. The project says existing Confluent serializers and Java, Go, and Python Kafka clients can connect by changing 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 go to stdout, files, syslog, or webhooks. Client-side field encryption supports DEK/KEK registries and HashiCorp Vault or OpenBao Transit. Data contracts add metadata and rules. A beta MCP server supports several AI clients. It runs self-hosted on Linux, as a Docker container, or from source.

TIBCO Messaging Schema Repository for Apache Kafka is a REST service for registering and managing Apache Avro JSON schemas used by producer applications and consumer applications. It checks compatibility as schemas evolve and keeps schema versions available so applications can use the message format they need. Compatibility settings include backward, forward, and full policies, their transitive variants, and none; BACKWARD is the default. OAuth2 roles control REST operations by default, with restrictions configurable to the subject level. The repository provides OpenAPI documentation and interactive queries through Swagger UI, and Kafka clients and brokers can use it to manage Avro schemas. TIBCO Enterprise Message Service Kafka transports can also retrieve schemas for deserializing imported Kafka payloads. TIBCO FTL is required for storage. Version 2.0.0 has 64-bit Intel Linux packages and a 64-bit Intel macOS installer, though macOS x86-64 support is marked deprecated. The Community Edition is free for up to 100 application instances or 1,000 web/mobile instances in production, without TIBCO Support. Version 2.0.0 support ends April 30, 2027.