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Abby

Open-source A/B testing and feature flags

Web Analytics ★ 166 stars Medium setup MIT

Abby is an open-source platform for A/B testing and feature flags that can be self-hosted. It reports conversion metrics and lets teams roll out features gradually.

Official siteSource code

Key features

  • A/B testing
  • Feature flags
  • Conversion metrics
  • Gradual rollouts

Strengths

  • Released under the MIT license
  • First-class Docker support for quick deployment
  • Written in TypeScript
  • Lightweight — runs in 512 MB RAM

Is Abby secure?

OSV.dev has no published security advisories for Abby's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Abby replaces

Self-hosted LaunchDarkly alternativesSelf-hosted Optimizely alternatives

Health badge

Maintain Abby? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 18 · at risk

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[![SelfHostIndex health score for Abby](https://selfhostindex.com/badge/abby-feature-flags.svg)](https://selfhostindex.com/app/abby-feature-flags/)
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<a href="https://selfhostindex.com/app/abby-feature-flags/"><img src="https://selfhostindex.com/badge/abby-feature-flags.svg" alt="SelfHostIndex health score for Abby"></a>
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.. image:: https://selfhostindex.com/badge/abby-feature-flags.svg
   :alt: SelfHostIndex health score for Abby
   :target: https://selfhostindex.com/app/abby-feature-flags/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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