Free Developer; production pricing by quote
Striim
CDC tool
Change data capture and streaming integration with visual pipeline design, SQL-like in-flight processing, and managed or self-managed deployment.
Streaming and CDC
Change data capture and event streams for data that cannot wait for the nightly batch.
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Usage-based Cloud; open-source core
RisingWave
Streaming database
A streaming SQL database that continuously maintains query results over changing data and serves them through a PostgreSQL-compatible interface.
From $73/month
StreamNative
Streaming platform
Managed Kafka and Pulsar streaming with hosted, BYOC and private-cloud deployment options, plus connectors and Iceberg/Delta table delivery.
Usage-based Cloud; limited free self-managed license
Materialize
Streaming database
A streaming SQL database that incrementally maintains query results over changing data for applications and analytics.
Apache Pulsar
Streaming platform
Open-source messaging and streaming platform with four subscription types, built-in multi-tenancy, geo-replication and tiered storage.
Spark Structured Streaming
Stream processing
Apache Spark's built-in streaming engine: one DataFrame API for batch and streams, exactly-once to files, Real-time Mode since 4.1. Free; you pay the platform.
Apache Flink
Stream processing
Open-source stateful stream processing engine: event-at-a-time, exactly-once checkpoints, Flink SQL. Free; managed from $0.11 per KPU-hour.
Amazon Kinesis / MSK
Streaming platform
AWS's two managed streaming services: Kinesis Data Streams (serverless, per-GB) and Amazon MSK (managed Apache Kafka, per broker-hour).
Google Pub/Sub
Streaming platform
Google Cloud's serverless messaging service: no partitions to size, $40 per TiB after 10 GiB free, direct delivery into BigQuery and Cloud Storage.
Azure Event Hubs
Streaming platform
Managed, Kafka-compatible event streaming on Azure, billed per throughput unit by the hour, with Capture to Blob or Data Lake Storage.
Estuary Flow
CDC tool
Managed real-time CDC and ELT platform (formerly Estuary Flow): log-based capture into replayable collections, delivered to warehouses, lakes and Kafka clients.
Open source Debezium
CDC tool
Open-source change data capture software that streams database changes through Kafka Connect, Debezium Server, or an embedded Java engine.
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