Karapace vs TIBCO Messaging Schema Repository for Apache Kafka

Karapace is Aiven’s open-source Schema Registry and REST Proxy for Aiven for Apache Kafka. The registry stores and versions schemas, then checks compatibility before a changed schema is published. It accepts Avro, Protobuf, and JSON Schema, with references supported for Avro and Protobuf. Compatibility modes include NONE, BACKWARD, BACKWARD_TRANSITIVE, FORWARD, FORWARD_TRANSITIVE, FULL, and FULL_TRANSITIVE. The REST Proxy exposes HTTP endpoints for producing and consuming Kafka events, so scripts, curl, and HTTP services can work with events. OAuth 2.0/OIDC authentication is available for both components. Registry ACLs and OIDC role-based rules can limit operations, including by HTTP method. Example identity providers include Auth0, Okta, Google Identity Platform, and Azure. Deployment documentation covers Docker and installation from source with pip; the API is stated to support Schema Registry 6.1.1 operations. Karapace is available in Aiven’s Kafka free tier for learning, prototyping, and evaluation. The Free plan costs nothing, while Developer costs $35 a month.

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.