Apache Flink vs RisingWave: Which is Better in 2026?
Apache Flink and RisingWave are both Stream Processing tools, made for different people. Apache Flink is for data and platform engineers running large stateful streaming jobs who need exactly-once results and can operate a cluster or pay for a managed one. RisingWave is for teams that want streaming pipelines written in Postgres-style SQL, with results they can query directly or land in Iceberg.
Quick verdict
There’s no single winner; pick on your constraint. Choose Apache Flink if you run windowed joins and aggregations with a lot of state. Choose RisingWave if you want streaming jobs as SQL rather than Java.
Apache Flink vs RisingWave: Side by Side
| Apache Flink | RisingWave | |
|---|---|---|
| Category | Stream Processing | Stream Processing |
| What it is | Distributed stream processing engine | Streaming database |
| Write jobs in | Flink SQL or the DataStream API | PostgreSQL-style SQL |
| Licence | Apache 2.0 | Apache 2.0 |
| Where it runs | Your cluster or a managed service | RisingWave Cloud, BYOC or self-hosted |
| How you pay | Free; managed services bill by compute | From $0.227 per RWU-hour on Cloud Basic |
| Pricing | Free · paid from $0.11/mo | Free · paid from $0.227/mo |
| Starting price | Free tier available | Free tier available |
| Free tier | ||
| Rating | 4.6 | 4.4 |
| Best for | Stream Processing: stateful streaming, exactly-once, Flink SQL | Stream Processing: streaming SQL, Postgres-compatible, Iceberg |
Ratings are App Stack Builder’s editorial score out of 5, not an average of user reviews.
Pros & Cons
- Exactly-once state consistency
- Handles very large state
- SQL and low-level APIs in one engine
- Managed options on major clouds
- Operating clusters and checkpoints takes expertise
- Steep learning curve beyond SQL
- JVM tuning for big jobs
- Plain Postgres-style SQL for streaming
- Native Iceberg integration
- Apache 2.0 engine
- Published cloud rate
- Younger than Flink
- Pro and enterprise pricing by quote
- Not a general-purpose transactional database
Key Features Compared
Apache Flink
- Apache Software Foundation project, free; 2.3 is the current stable line
- Exactly-once state consistency, event-time processing and late data handling
- Very large state with incremental checkpoints; savepoints for upgrades
- Flink SQL, the DataStream API and ProcessFunction for different levels of control
- Amazon Managed Service for Apache Flink: $0.11 per KPU-hour in US East, plus 1 KPU per application and $0.10 per GB-month of running storage
RisingWave
- Apache 2.0 engine; connects over the PostgreSQL wire protocol (psql, JDBC and Postgres tools work)
- Ingests from databases, event streams and webhooks and updates results incrementally
- Native Apache Iceberg integration with a hosted REST catalog and table maintenance
- Cloud Basic from $0.227 per RWU-hour on AWS, GCP or Azure, up to 64 cores, 7-day trial
- Cloud Pro (BYOC, no core limit) and self-managed licences priced by sales; network billed separately
Choose Apache Flink if…
- Budget is tight: paid plans start lower ($0.11/mo vs $0.227/mo).
- You run windowed joins and aggregations with a lot of state.
- Your results must be exactly-once even after failures and restarts.
- You want the same engine for streaming and batch jobs.
Choose RisingWave if…
- You want streaming jobs as SQL rather than Java.
- You want to query the live results from any Postgres client.
- Your output goes to Apache Iceberg tables.
Frequently Asked Questions
Is Apache Flink better than RisingWave?⌄
There’s no single winner; pick on your constraint. Choose Apache Flink if you run windowed joins and aggregations with a lot of state. Choose RisingWave if you want streaming jobs as SQL rather than Java.
What is the difference between Apache Flink and RisingWave?⌄
What it is. Apache Flink: Distributed stream processing engine. RisingWave: Streaming database. Write jobs in. Apache Flink: Flink SQL or the DataStream API. RisingWave: PostgreSQL-style SQL. Where it runs. Apache Flink: Your cluster or a managed service. RisingWave: RisingWave Cloud, BYOC or self-hosted. How you pay. Apache Flink: Free; managed services bill by compute. RisingWave: From $0.227 per RWU-hour on Cloud Basic.
Apache Flink vs RisingWave: which is cheaper?⌄
Apache Flink pricing: Free · paid from $0.11/mo. RisingWave pricing: Free · paid from $0.227/mo. Confirm current pricing on each tool's official site, as plans change.
Which is rated higher, Apache Flink or RisingWave?⌄
On our editorial score, Apache Flink is 4.6 out of 5 and RisingWave is 4.4 out of 5, so Apache Flink is slightly ahead. This is our own score, not an average of user reviews.
When should I skip both Apache Flink and RisingWave?⌄
Skip Apache Flink if your data starts and ends in Kafka and the logic is modest. Kafka Streams needs no cluster. Skip RisingWave if you need custom stateful logic in code. Apache Flink gives you lower-level APIs.
Sources · tool facts checked November 2026
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