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Chaos Toolkit

No phone app

8.2No. 1 of 21
in Chaos Engineering Platforms
  • Recognised40% of the score100
  • Phone app26% of the score0
  • Documented20% of the score88
  • Free plan14% of the score100
Free plan
Yes
Runs on
api, Linux, Mac, self-hosted, Web, Windows
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Summary

Chaos Toolkit is a free, open-source toolkit for developers who want to explore systems and look for weaknesses through chaos engineering. An experiment defines a steady-state hypothesis and probes to check whether the system meets it, along with a method made of actions and probes. If the steady state is not met, the method is not applied and the experiment must stop. Experiments can be saved as JSON or YAML, making them suitable for collaboration and orchestration alongside code. The toolkit extends to systems through its Open API and can be embedded in a CI/CD chain. Listed integrations include AWS, Azure, Google Cloud Platform, Kubernetes, Kafka, Slack, Datadog, Grafana, OpenTelemetry, and Prometheus. The standalone CLI is licensed under Apache License 2.0 and is implemented in Python 3, officially supporting Python 3.8 and later; it has only been tested against CPython. Installation guidance covers macOS, Debian or Ubuntu, and Windows. Users can add extensions after installing the CLI and core library. Reliably is a separate platform, not the standalone CLI.

Who it is for

It suits developers who want to define and run system experiments as code, including in a CI/CD chain. Users should be comfortable with Python 3 and installing extensions for different areas of chaos engineering.

What is good

  • Free CLI under Apache License 2.0.
  • Experiments can be saved as JSON or YAML.
  • Can be embedded in a CI/CD chain.
  • Includes a safety gate based on steady-state checks.
  • Listed integrations include cloud, monitoring, and orchestration tools.

What to know first

  • Officially supports Python 3.8 and later.
  • Tested only against CPython.
  • Extensions require installing the CLI and core library first.

Verdict

Chaos Toolkit gives developers a code-oriented way to define experiments, with a steady-state check that can stop a method from running. It is a free standalone CLI; Reliably is a separate offering.

Chaos Toolkit plans and pricing

All plans
Chaos Toolkit Free Open source CLI · free forever · Apache License 2.0 chaostoolkit.org · 28 Sept 2026

Compared on chaos engineering platforms

Free plan
Yeschaostoolkit.org
Kubernetes support
Yeschaostoolkit.org
Cloud fault injection
Yeschaostoolkit.org
Network fault injection
Yeschaostoolkit.org
Experiment scheduling
Yeschaostoolkit.org
Deployment model
self_hostedchaostoolkit.org
Blast-radius controls
Yeschaostoolkit.org

Facts

Purpose
Chaos Toolkit is a chaos engineering toolkit for developers to explore and test systems to discover weaknesses.chaostoolkit.org · 28 Sept 2026
Experiment format
Experiments can be declared and stored as JSON or YAML files for collaboration and orchestration like other code.chaostoolkit.org · 28 Sept 2026
Open API
The toolkit is extensible for systems through its Open API.chaostoolkit.org · 28 Sept 2026
Automation
The toolkit can be embedded in a CI/CD chain.chaostoolkit.org · 28 Sept 2026
License
The toolkit is open source under the Apache 2 license.chaostoolkit.org · 28 Sept 2026
Experiments
An experiment declares a steady-state hypothesis and probes to validate it, plus a method made up of actions and probes.chaostoolkit.org · 28 Sept 2026
Safety gate
If the steady state is not met, the method is not applied and the experiment must bail out.chaostoolkit.org · 28 Sept 2026
Integrations
The extension directory lists integrations including AWS, Azure, Google Cloud Platform, Kubernetes, Kafka, Slack, Datadog, Grafana, OpenTelemetry and Prometheus.chaostoolkit.org · 28 Sept 2026
Supported runtime
The CLI is implemented in Python 3, officially supports Python 3.8+, and has only been tested against CPython.chaostoolkit.org · 28 Sept 2026
Installation
The installation guide provides Python setup instructions for macOS, Debian or Ubuntu, and Windows, and installs the CLI using pip.chaostoolkit.org · 28 Sept 2026
Extensions
After installing the CLI and core library, users can install extensions for different facets of chaos engineering.chaostoolkit.org · 28 Sept 2026
Deployment options
The offering page describes a standalone open source CLI; it distinguishes Reliably as a separate platform with SaaS, private SaaS and on-premises options.chaostoolkit.org · 28 Sept 2026
Community
The project invites contributions through issue reports, issue voting, project stars, community Slack, pull requests and extension proposals.chaostoolkit.org · 28 Sept 2026
Security practice
The contribution guide suggests contributor accounts enable 2FA to reduce security risks if an account is breached.chaostoolkit.org · 28 Sept 2026

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