head to head · open source
Unleash vs Abby
Unleash has 13,924 GitHub stars, 919 forks, 39 open issues and last shipped yesterday. Abby has 167 stars, 49 forks, 31 open issues and last shipped 1.3 years ago. Unleash leads on adoption by 8,238% (13,924 vs 167 stars). Unleash is written in TypeScript under AGPL-3.0; Abby is written in TypeScript under AGPL-3.0. Unleash has attracted 7% as many forks as stars, Abby 29%. Unleash was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (feature-flags, feature-toggles), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Unleash | Abby | |
|---|---|---|
| GitHub stars | ★ 14K | ★ 167 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2025-07-24 |
| Forks | ⑂ 919 | ⑂ 49 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Unleash if
- You weight community size — 14K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Abby if
- You want the Abby feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Abby fits your workflow better
About Unleash
Launch the live demo Try Unleash Enterprise for free What is Unleash? Unleash is a powerful open source solution for feature management. It streamlines your development workflow, accelerates software delivery, and empowers teams to control how and when they roll out new features to end users. With Unleash, you can deploy code to production in smaller, more manageable releases at your own pace. Feature flags in Unleash let you test your code with real production data, reducing the risk of negatively impacting your users' experience. It also enables your team to work on multiple features simultaneously without the…
read the full Unleash overview →
About Abby
About Abby Abby is a open source feature management and A/B testing platform. It is designed to be easy to use and easy to integrate into your existing applications. It aims to improve the developer experience by providing a simple and statically typed API for feature management and A/B testing. Besides its official SDKS it also offers a friendly and easy to understand Dashboard for the non developers in your team. Abby focuses on privacy. This means it won't track any personalized user data and uses no marketing cookies. You can self host it or use the hosted version available at tryabby.com. Getting Started…
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Frequently asked questions
Is Unleash or Abby more popular?
Unleash has 13,924 GitHub stars and Abby has 167. Unleash has the larger community by that measure.
Are Unleash and Abby free?
Both are open source. Unleash is licensed under AGPL-3.0 and Abby under AGPL-3.0. Neither carries a licence fee.
What is the difference between Unleash and Abby?
Unleash is written in TypeScript and Abby in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Unleash or Abby?
Choose Unleash if you want the larger community (13,924 stars) or its AGPL-3.0 licence terms. Choose Abby if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.