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Flake

Free#11 of 31 in Test Flakiness Management SoftwareCI Failure Analysis And Flaky Test Tools

Flake: Open-source CLI for controlled flakiness reproduction and deterministic diagnosis. Ranked #11 of 31 in Test Flakiness Management Software by our editors (8.0/10); pricing: Free plan; best for developers debugging reproducible local flakiness.

8.0/10Editor score
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At a glance

  • Editor score
    8.0 / 10
  • Pricing
    Free plan
  • Best for
    Developers debugging reproducible local flakiness
  • Free plan
    Yes
  • Paid from
    Free
  • Quarantine workflow
    No
  • Facts checked
    22 Sep 2026
Flake screenshot

  • Where it wins

    • Controlled variation isolates order, seed, locale, and parallelism effects
    • Delta debugging minimizes reproducible failure conditions
    • Replay commands and SARIF, JSON, and Markdown reports support investigation

  • Where it doesn't

    • No quarantine workflow for automatically managing flaky tests
    • GitHub Actions is the only listed integration
    • Local SQLite storage replaces shared dashboard or cloud collaboration

Our verdict on Flake

Flake is an open-source Go CLI and GitHub Action for detecting and diagnosing flaky tests. It is intended for software engineering teams working with pytest, Jest, or Vitest that want local analysis across Windows, macOS, and Linux. The tool repeatedly runs test suites, calculates failure rates, and examines controlled changes to test order, seeds, parallelism, workers, time zones, locales, and temporary directories. Its local-first design keeps incidents in SQLite and does not require a web dashboard, server, cloud service, authentication, or source-code uploads.

Its strongest area is controlled reproduction. Flake can minimize reproducible failures through delta debugging, analyze suspected causes deterministically from observed evidence, normalize failure signatures, group incidents, and produce exact replay commands. Configurable replay runs help turn an intermittent failure into a repeatable investigation. For teams whose main problem is understanding why a test fails under particular execution conditions, this is a focused feature set. The GitHub Action extends that workflow with Markdown, JSON, and SARIF reports, while GitHub Actions is the listed integration.

Flake is less suited to teams seeking a broader operational workflow around flaky tests. There is no quarantine workflow, and the product is centered on local incident storage rather than a shared dashboard or cloud service. It also does not include AI features. Choose Flake when developers need open-source, cross-platform reproduction, minimization, cause analysis, and replay for pytest, Jest, or Vitest. Consider an alternative when centralized collaboration, additional integrations, or automated quarantine management is more important than controlled local diagnosis.

Your product? Our editors can test Flake in depth and publish a review, labelled as paid · from $149/mo →

Flake pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on github.com

Flake fact sheet

Free planYes
Paid fromFree
Flake detectionYes
Quarantine workflowNo
Failure clusteringYes
Rerun policiesYes
Supported frameworkspytest, Jest, Vitest
Issue tracker linksNot verified
DeploymentSelf-hosted
PlatformsWindows, macOS, Linux
SupportDocs
Built forSolo, Small business, Mid-market (editorial estimate)
Integrations1 integrations: GitHub Actions
PricingFree plan
Websitegithub.com
Facts checked22 Sep 2026

Flake integrations

Flake lists 1 integrations on its own site.

  • GitHub Actions

Alternatives to Flake

See all Flake alternatives →

Also Ranked In

Flake is ranked in 2 of our directories.

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Featured on iTechGuides

Featured on iTechGuides — Flake 8.0/10

Flake is listed in our Test Flakiness Management Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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