Chaos Toolkit vs Gremlin

Chaos Toolkit9.3Visit Gremlin8.9Visit

Higher score Chaos Toolkit #1 in Chaos Engineering Platforms 9.3/10 Free plan Free plan✓ 5 of 5 features Visit Chaos Toolkit

vs

Gremlin #4 in Chaos Engineering Platforms 8.9/10 Pricing on request · 30-day trial Free trial✓ 5 of 5 features Visit Gremlin

• Chaos Toolkit fits best

  Broad, low-cost multi-cloud chaos testing

• Gremlin fits best

  Enterprise teams needing deep managed chaos

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Side by side

Feature	Chaos Toolkit 9.3/10 Visit ↗	Gremlin 8.9/10 Visit ↗
At a glance
Editor score	9.3	8.9
Ranking	#1 in Chaos Engineering Platforms	#4 in Chaos Engineering Platforms
Best for	Broad, low-cost multi-cloud chaos testing	Enterprise teams needing deep managed chaos
Pricing model	Free	Paid
Starting price	Free	—
Free plan	✓ (best)	—
Free trial	—	30 days
Deployment	Self-hosted, Desktop, Browser extension	Cloud, Self-hosted
Platforms	Web, Windows, macOS, Linux	Web, Windows, Linux
Support	Docs	Email, Phone, Community, Docs
Integrations	12 integrations	12 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Mid-market, Enterprise
Features Chaos Toolkit 5/5 · Gremlin 5/5
Kubernetes support	✓	✓
Cloud fault injection	✓	✓
Network fault injection	✓	✓
Experiment scheduling	✓	✓
Blast-radius controls	✓	✓
Specs
Deployment model	Self_hosted	Hybrid
Our review
Pros	Supports Kubernetes, AWS, Azure, and Google Cloud experiments Includes safeguards, controls, rollbacks, and steady-state hypotheses Offers 300+ actions and probes plus custom extensions	Controlled experiments across hosts, containers, Kubernetes, and serverless Health checks, automatic halt, rollback, and blast-radius controls Reliability scores, reporting, scenarios, APIs, and broad integrations
Cons	The standalone interface is a command-line toolkit Scheduling uses Kubernetes CronJobs or external automation Custom extensions require Python, HTTP, or process providers	Paid pricing requires contacting sales There is no free plan Fault Injection is also offered as a standalone product
Our verdict	Chaos Toolkit is an open-source, Python-based toolkit for developers defining and running chaos engineering experiments. Experiments are written in JSON or YAML and executed through a standalone command-line interface. The toolkit covers… Read the review →	Gremlin is a chaos engineering and reliability platform for SRE, platform, and engineering teams. It supports controlled fault injection across services, hosts, containers, Kubernetes resources, and serverless workloads. Teams can run… Read the review →

Strengths and trade-offs

• Chaos Toolkit — where it wins

  • Supports Kubernetes, AWS, Azure, and Google Cloud experiments
  • Includes safeguards, controls, rollbacks, and steady-state hypotheses
  • Offers 300+ actions and probes plus custom extensions

  Where it doesn't

  • The standalone interface is a command-line toolkit
  • Scheduling uses Kubernetes CronJobs or external automation
  • Custom extensions require Python, HTTP, or process providers

• Gremlin — where it wins

  • Controlled experiments across hosts, containers, Kubernetes, and serverless
  • Health checks, automatic halt, rollback, and blast-radius controls
  • Reliability scores, reporting, scenarios, APIs, and broad integrations

  Where it doesn't

  • Paid pricing requires contacting sales
  • There is no free plan
  • Fault Injection is also offered as a standalone product

• Chaos Toolkit9.3/10 · Free plan

  Broad, low-cost multi-cloud chaos testing with declarative experiments and safeguards.

  Visit Chaos ToolkitFull verdict →
• Gremlin8.9/10 · Pricing on request · 30-day trial

  A broad managed chaos platform for controlled failure testing across modern infrastructure.

  Visit GremlinFull verdict →