Apache Flink
Data Engineering · Free + paid
Stateful stream processing framework
At a glance
- Made by
- Apache Software Foundation
- Korean
- None (English and a few others only)
- API
- Yes
- Available on
- API
- Open source
- Open source (the software license name is not in the retrieved text; website content is under Apache License v2)
- GitHub
- 26,407 stars · Apache-2.0
What is Apache Flink?
Apache Flink is a framework and distributed processing engine for stateful computations over unbounded and bounded data streams. It is designed to run in all common cluster environments and performs computations at in-memory speed and at any scale. Its stream-processing-first runtime supports both batch and streaming programs and provides exactly-once processing guarantees. It also has sub-projects such as Kubernetes Operator, CDC, Agents, ML, and Stateful Functions.
- Exactly-once state consistency and event-time processing
- Handling late-arriving data
- SQL, DataStream API, and ProcessFunction for stream and batch data
- Savepoints and high-availability setup
- Very large state support and incremental checkpoints
- Low-latency, high-throughput in-memory computation
- Flexible windows by time, count, session, and more
- Integration with the Hadoop ecosystem, including YARN, HDFS, and HBase
Who uses Apache Flink and for what
- Event-driven applications
- Stream and batch analytics
- Data pipelines and ETL
Pricing
What you get for free — Open source — no paid plans on the official page
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying.
AI tools similar to Apache Flink (alternatives)
Apache Flink vs. alternatives at a glance
| AI | Pricing | Combos on the map | Connected tools | Free | Cheapest monthly | Korean |
|---|---|---|---|---|---|---|
| Apache Flink | Free + paid | 0 | 6 | No | — | No |
| Apache Hadoop | Free + paid | 0 | 6 | No | — | No |
| Apache Kafka | Free + paid | 10 | 6 | No | — | No |
| Apache Pulsar | Free + paid | 0 | 6 | No | — | No |
| Apache Spark | Free + paid | 0 | 6 | No | — | No |
0 of these 5 tools have a free plan.
Combo and connection counts are based on the relationships recorded on AI Galaxy Map (2026-10-26); they are not a quality ranking.
Apache Flink on AI Galaxy Map
- One of 24 AI tools in the Data Engineering field.
- Connected to 6 other tools — #1 in its field.
Frequently asked questions
Can I use Apache Flink for free?
Open source — no paid plans on the official page. Prices can change, so check the official site before paying.
What AI can I use instead of Apache Flink?
Tools that do the same job, such as Apache Hadoop, Apache Kafka, Apache Pulsar, Apache Spark, are connected to it on the map.
Can I use Apache Flink in Korean?
None (English and a few others only)
Sources (official pages)
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying.