Apache Kafka vs ksqlDB
Side-by-side comparison of Apache Kafka and ksqlDB to help you choose the right tool.
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| Feature | Apache Kafka | ksqlDB |
|---|---|---|
| Pricing | Free (open source) | Free / Included with Confluent |
| Rating | ⭐ 4.5/5 | ⭐ 4.3/5 |
| Categories | streaming | streaming |
| Event streaming | ✅ | ❌ |
| Exactly-once semantics | ✅ | ❌ |
| Kafka Streams | ✅ | ❌ |
| Connect framework | ✅ | ❌ |
| Partitioned logs | ✅ | ❌ |
| Replication | ✅ | ❌ |
| SQL on Kafka | ❌ | ✅ |
| Materialized views | ❌ | ✅ |
| Pull & push queries | ❌ | ✅ |
| Connectors | ❌ | ✅ |
| Windowing | ❌ | ✅ |
| User-defined functions | ❌ | ✅ |
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