Apache Flink vs ksqlDB

Side-by-side comparison of Apache Flink and ksqlDB to help you choose the right tool.

Feature	Apache Flink	ksqlDB
Pricing	Free (open source)	Free / Included with Confluent
Rating	⭐ 4.4/5	⭐ 4.3/5
Categories	streaming, etl-elt	streaming
Stateful streaming	✅	❌
Exactly-once processing	✅	❌
Event time handling	✅	❌
Windowing	✅	✅
SQL support	✅	❌
Savepoints	✅	❌
SQL on Kafka	❌	✅
Materialized views	❌	✅
Pull & push queries	❌	✅
Connectors	❌	✅
User-defined functions	❌	✅

Stream and batch processing framework

Event streaming database for Kafka

Try ksqlDB →