head to head · open source
Unleash vs Abby
Unleash has 13,811 GitHub stars, 896 forks, 39 open issues and last shipped yesterday. Abby has 166 stars, 30 forks, 31 open issues and last shipped 1.2 years ago. Unleash leads on adoption by 8,220% (13,811 vs 166 stars). Unleash is written in TypeScript under AGPL-3.0; Abby is written in TypeScript under AGPL-3.0. Unleash has attracted 6% as many forks as stars, Abby 18%. 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 | ★ 166 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-17 | 2025-07-24 |
| Forks | ⑂ 896 | ⑂ 30 |
| 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
Unleash is an open source feature management platform written in TypeScript and released under the AGPL 3.0 license. It lives in the DevOps, continuous delivery, and application security ecosystem, and its topics describe feature flags, feature toggles, activation strategies, experiments, and collaboration.
read the full Unleash overview →
About Abby
Abby is an open source, TypeScript feature management and A/B testing platform that pairs statically typed SDKs for core JavaScript, React, Next.js, Angular and Svelte with a dashboard the non developers on a team can use, aimed at developers who want feature flags and remote config without sending user data to a third party.
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Frequently asked questions
Is Unleash or Abby more popular?
Unleash has 13,811 GitHub stars and Abby has 166. 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 (13,811 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.