Siddhi

Free plan APILinuxMacSelf-hostedWindows

What Siddhi is

Siddhi is a free, open-source stream and complex event processing engine for building event-driven applications. It processes event data with Siddhi Streaming SQL, which users can write in a graphical or text editor. Processing capabilities include filtering, preprocessing, time and event windows, aggregations, pattern detection, and rule processing; the site also lists online and pretrained machine-learning models. Its documented use cases include real-time analytics, data integration, notification management, and adaptive decision-making. Siddhi connects with messaging systems such as Kafka, NATS, RabbitMQ, JMS, and MQTT, as well as HTTP and gRPC services, databases, files, email, and WebSocket. Supported formats include JSON, XML, Avro, Protobuf, text, binary, key-value, and CSV. Deployment options range from Java or Python libraries and microservices on bare metal or virtual machines to Docker and Kubernetes at scale. Tooling includes an event simulator and test framework support for unit, integration, and black-box tests in CI/CD workflows. Siddhi is self-hosted and licensed under Apache License 2.0. The project says it has been integrated into WSO2 Enterprise Integrator, with future releases made as part of EI.

Who it suits

Siddhi suits developers and teams building event-driven applications that need to process streams, integrate data, or apply rules and analytics. It offers several deployment forms and connectors for messaging systems, services, databases, and files.

What it does well

Supports event and time windows and aggregations.
Offers both graphical and text query editors.
Runs as libraries, microservices, Docker, or Kubernetes.
Includes an event simulator and testing support.
Licensed under Apache License 2.0.

What to know first

Deployment is self-hosted.
PySiddhi lists macOS and Linux as supported platforms.
Future releases are made as part of WSO2 Enterprise Integrator.

Getting started

Visit https://siddhi.io/ and review the documentation and download options.
Choose a deployment approach: Java or Python library, microservice, Docker, or Kubernetes.
For PySiddhi, use a supported macOS or Linux platform.
Write processing logic in Siddhi Streaming SQL with the graphical or source editor.
Use the event simulator and test framework support to work with Siddhi applications.

Verdict

Siddhi provides a broad set of event-processing operations, integrations, and deployment options for self-hosted use. Note the project’s stated integration into WSO2 Enterprise Integrator and its release plans.

Questions

Is Siddhi free?

Yes. Siddhi is free and open source under the Apache License 2.0.

Which platforms does Siddhi support?

The listed platforms include API, Linux, macOS, self-hosted, and Windows. PySiddhi downloads specifically list macOS and Linux.

How can Siddhi be deployed?

It can run as a Java or Python library, as a microservice on bare metal or a VM, in Docker, or at scale on Kubernetes.

What integrations and data formats does Siddhi support?

Listed integrations include messaging systems, services, databases, filesystems, email, and WebSocket. Formats include JSON, XML, Avro, Protobuf, text, binary, key-value, and CSV.

What is Siddhi's license?

Siddhi is licensed under Apache License 2.0.

Does Siddhi have a free plan limit?

Siddhi is listed as free and open source; no plan quota or trial terms are given.

Facts from Siddhi's own pages

Analytics and rules: Features include event-window and time-based aggregation, complex event patterns and sequences, rule processing, and online or pretrained machine-learning models. · siddhi.io, 5 Oct 2026
Connectors: The site lists integrations with messaging systems including NATS, Kafka, and JMS, plus databases, HTTP and gRPC services, filesystems, and email. · siddhi.io, 5 Oct 2026
Data formats: The site lists JSON, XML, Avro, Protobuf, text, binary, key-value, and CSV message formats. · siddhi.io, 5 Oct 2026
Data stores: Listed data-store integrations include MySQL, Oracle, MSSQL, Postgre, Redis, MongoDB, HBase, Cassandra, Solr, and Elasticsearch. · siddhi.io, 5 Oct 2026
Deployment: Siddhi can run embedded as a Java or Python library, as a microservice on bare metal or a VM, in Docker, or on Kubernetes. · siddhi.io, 5 Oct 2026
Deployment automation: The site describes test framework support for unit, integration, and black-box tests as part of a CI/CD workflow. · siddhi.io, 5 Oct 2026
Editor: Siddhi tooling includes text and graphical query editors and an event simulator for testing Siddhi applications. · siddhi.io, 5 Oct 2026
Formats and sources: The features documentation lists JSON, XML, Avro, Protobuf, text, binary, key-value, and CSV formats, along with sources including RabbitMQ, MQTT, Amazon SQS, Google Pub/Sub, and WebSocket. · siddhi.io, 5 Oct 2026
Integrations: Supported event sources and destinations listed include Kafka, NATS, RabbitMQ, HTTP, gRPC, JMS, MQTT, Amazon SQS, Google Pub/Sub, email, files, and WebSocket. · siddhi.io, 5 Oct 2026
License: The Siddhi license page identifies Apache License 2.0. · siddhi.io, 5 Oct 2026
Operating systems: The download page lists MacOS and Linux as supported platforms for PySiddhi 5.1.0. · siddhi.io, 5 Oct 2026
Processing features: The features documentation lists event filtering and preprocessing, time and event windows, aggregations, pattern detection, and rule processing. · siddhi.io, 5 Oct 2026
Product: Siddhi is an open source stream and complex event processing engine for building event-driven applications. · siddhi.io, 5 Oct 2026
Project status: The homepage says Siddhi has been integrated into WSO2 Enterprise Integrator and future releases will be made as part of EI. · siddhi.io, 5 Oct 2026
Query language: Processing logic can be written in Siddhi Streaming SQL through a graphical editor or source editor. · siddhi.io, 5 Oct 2026
Reliability: The homepage claims zero event loss and exactly-once event processing. · siddhi.io, 5 Oct 2026
Requirements: The documentation specifies 128 MB minimum memory, recommends 500 MB and two cores, and lists JDK 8 or 11 for execution modes. · siddhi.io, 5 Oct 2026
Security: WSO2 asks vulnerability reports to be sent privately to its security mailing list and says initial response time will be under one hour. · siddhi.io, 5 Oct 2026
Security reporting: The security page asks users to report vulnerabilities privately to WSO2’s security mailing list before public disclosure and says initial response is under one hour. · siddhi.io, 5 Oct 2026
Streaming SQL: Processing logic can be written as SQL-like scripts for consuming, processing, integrating, and publishing events. · siddhi.io, 5 Oct 2026
Support: The site links to community support resources including a mailing list, contribution information, and security reporting. · siddhi.io, 5 Oct 2026
Supported platforms: The PySiddhi download section explicitly lists macOS and Linux as supported platforms. · siddhi.io, 5 Oct 2026
Use cases: The site describes real-time analytics, data integration, notification management, and adaptive decision-making as use cases. · siddhi.io, 5 Oct 2026
What it does: Siddhi is an open-source stream and complex event processing platform for building event-driven applications. · siddhi.io, 5 Oct 2026

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