No. 22 of 25 ·Streaming Analytics Software

Apache Heron

Linux · Self-hosted

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Freedom report

No signalScore 4.9

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedThinly documented

Apache Heron is ranked #22 of 25 in streaming analytics software on Freedom251. It runs on Linux, Self-hosted.

Compared on streaming analytics software

Deployment: self_hosted

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The record

Status: Apache Heron retired on 2023-01-18.
What it does: Heron is a real-time, distributed, fault-tolerant stream processing engine.
Origin: Twitter developed Heron as a distributed streaming engine and donated it to the Apache Incubator in 2018.
Storm compatibility: Heron was built to be backwards compatible with the Apache Storm ecosystem and topology API.
Languages and architecture: Heron uses a process-based architecture and is written in Java, C++ and Python.
APIs: The project describes Java and Python Streamlets APIs, a Python API similar to Storm’s, and YAML-based ECO topology stitching.
Features: Heron supports backpressure, task isolation for troubleshooting, and configuring topologies for latency-sensitive or throughput-sensitive workloads.
State and processing: The project describes stateful and effectively-once processing, with adaptors for Apache Hadoop, Apache BookKeeper and the local file system.
Self-management: Dhalion is described as enabling Heron to self-tune, self-heal and self-stabilize when topologies encounter unexpected behavior.
Schedulers: The project lists Kubernetes, DC/OS, Nomad, SLURM and standalone as scheduler deployment options.
License: Heron was open sourced under the Apache License, Version 2.0.
Community support: The repository lists user and developer mailing lists, a Slack channel and a meetup group as community contact options.
Typical workloads: Twitter listed ETL, model enhancement, anomaly and fraud detection, IoT, embedded systems, VR/AR, ad bidding, financial, security and social media use cases.

Where it ranks on Freedom251

Best Streaming Analytics Software in 2026#22 of 25
Best Stream Processing Software in 2026#23 of 24

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Sources

incubator.apache.org/projects/heron.html· checked 4 Oct 2026
blog.x.com/engineering/en_us/topics/open-source/20· checked 4 Oct 2026
blog.x.com/engineering/en_us/topics/open-source/20· checked 4 Oct 2026
github.com/cckellogg/heron· checked 4 Oct 2026