Best Stream Processing Software in 2026
21 stream processing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
21ranked
15free plans on this page
$0.13/molowest paid tier
22 Sept 2026last checked
#1 Apache Flink Top pick · 8.7 Free plan · Free
#2 Hazelcast Platform Runner-up · 8.6 Free plan · Free
#3 Feldera Also great · 8.4 Free plan · Free- Free plan apiLinuxself-hosted
- Free plan
- Yes
- Deployment model
- self-hosted
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free planFree trial apiLinuxmacOSself-hostedWindows
- Free plan
- Yes
- Deployment model
- hybrid
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- Deployment model
- hybrid
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free planFree trial apiLinuxWeb
- Free plan
- Yes
- Paid from
- 385 /mo
- Deployment model
- cloud
RecognisedDocumentedFree planPlatformsFree trial - Free planFree trial apiLinuxself-hostedWeb
- Free plan
- Yes
- Deployment model
- hybrid
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial$0.13/mofirst paid tier About MaterializeVisit site - Free plan LinuxmacOSself-hostedWindows
- Free plan
- Yes
- Deployment model
- self-hosted
- SQL processing
- No
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxmacOSself-hostedWebWindowsRecognisedDocumentedFree planPlatformsFree trial
- Web
- Free plan
- No
- Deployment model
- cloud
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxmacOSself-hostedWindows
- Free plan
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan
- Free plan
- Yes
- Deployment model
- hybrid
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - WebmacOSLinux
- Deployment model
- hybrid
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxself-hosted
- Free plan
- Yes
- Deployment model
- self-hosted
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - LinuxmacOS
- Deployment model
- self-hosted
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan
- Free plan
- Yes
- Deployment model
- self-hosted
- SQL processing
- Yes
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- Deployment model
- self-hosted
- Stateful processing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free planFree trial apiLinuxmacOSself-hostedWeb
- Free plan
- No
- Deployment model
- hybrid
RecognisedDocumentedFree planPlatformsFree trial$0.23/mofirst paid tier About RisingWaveVisit site - Free plan AndroidLinuxmacOSself-hostedWindows
- Free plan
- Yes
RecognisedDocumentedFree planPlatformsFree trial€1666.67/mofirst paid tier About AFL++Visit site - Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Free plan
- No
- Paid from
- 199 /mo
RecognisedDocumentedFree planPlatformsFree trial$199/mofirst paid tier About TimeplusVisit site -
- Deployment model
- hybrid
- SQL processing
- No
- Stateful processing
- Yes
- Event-time windows
- Yes
RecognisedDocumentedFree planPlatformsFree trial -
- Deployment model
- self-hosted
- Stateful processing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - WebWindowsmacOSLinuxRecognisedDocumentedFree planPlatformsFree trial
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which stream processing software is ranked first on The Geeks Club?
Apache Flink is ranked #1 of 21 with a score of 8.7. Hazelcast Platform is second and Feldera third.
How many of these have a free plan?
15 of the 21 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Materialize has the lowest first paid tier we found: $0.13/mo.
How is this list ranked?
Certifications are listed from the provider's own catalogue with level, role and exam. Platforms are ranked on what each publishes: a free tier or trial, price, certificates offered, the devices it runs on and the depth of its documentation. Paid placements never change a rank.
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