Aiven for Apache Kafka vs StreamHouse

Aiven for Apache Kafka is a managed Kafka service that handles provisioning, patching, backups, security, and high availability. It runs on AWS, Google Cloud, Azure, DigitalOcean, OVH, and UpCloud, with cloud availability varying by plan. Tiered storage and diskless topics can keep topic data in cloud object storage so storage and compute scale independently. A managed Schema Registry powered by the open-source Karapace project is included, alongside predictive consumer-lag monitoring, Kafka Connect compatibility, and a REST proxy. Aiven describes clusters with automatic node recovery and multi-node deployment across availability zones, and lists a 99.99% uptime SLA for Professional. Connections can use mTLS and/or SASL authentication with ACL authorization; stored data is encrypted. The Free plan costs nothing and is capped at 250 KiB/s throughput, three days of retention, and five topics with two partitions each. Developer costs $35 a month, while Professional costs $180 a month. A free 30-day trial is listed for more memory or advanced features.

StreamHouse is an open-source, self-hostable system combining event streaming, processing, schema management, and observability. Developers can ingest events through REST, gRPC, or the Kafka protocol, then use its SQL engine to query streams and transform events in pipelines. Pipelines can continuously send SQL-transformed results to PostgreSQL and be managed through the CLI or an SDK. StreamHouse stores data in S3 and describes that storage as S3-native. Its schema registry supports JSON Schema, Avro, and Protobuf with compatibility checking. Listed sinks include PostgreSQL, S3, and Elasticsearch. Monitoring includes Prometheus metrics, Grafana dashboards, and real-time WebSocket metrics. Organization-scoped isolation and permissioned API keys provide access controls. Python and TypeScript SDKs are documented, while CLI installation is available through Homebrew or a shell installer. The project uses Apache License 2.0, and its stateless agents can scale like web servers.