head to head · open source
GrowthBook vs Abby
GrowthBook has 8,376 GitHub stars, 849 forks, 793 open issues and last shipped yesterday. Abby has 166 stars, 30 forks, 31 open issues and last shipped 1.2 years ago. GrowthBook leads on adoption by 4,946% (8,376 vs 166 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; Abby is written in TypeScript under AGPL-3.0. GrowthBook has attracted 10% as many forks as stars, Abby 18%. GrowthBook was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| GrowthBook | Abby | |
|---|---|---|
| GitHub stars | ★ 8.4K | ★ 166 |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-17 | 2025-07-24 |
| Forks | ⑂ 849 | ⑂ 30 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GrowthBook if
- You weight community size — 8.4K stars and counting
- You want the Custom / other 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 GrowthBook
GrowthBook is an open source platform for feature flags, A/B experimentation, and product analytics that product, data, and platform teams can either consume through a hosted cloud account or run entirely on their own infrastructure.
read the full GrowthBook 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 GrowthBook or Abby more popular?
GrowthBook has 8,376 GitHub stars and Abby has 166. GrowthBook has the larger community by that measure.
Are GrowthBook and Abby free?
Both are open source. GrowthBook has no licence declared in this registry, and Abby is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between GrowthBook and Abby?
GrowthBook 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, GrowthBook or Abby?
Choose GrowthBook if you want the larger community (8,376 stars) or its Custom / other licence terms. Choose Abby if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.