Abby vs Flagsmith
A side-by-side comparison of two self-hosted web analytics options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Abby | Flagsmith |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 20 · At risk | 91 · Excellent |
| Category | Web Analytics | Web Analytics |
| License | MIT | BSD-3-Clause |
| Language | TypeScript | Python |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 1,024 MB |
| Deployment | docker | docker, kubernetes, helm |
| GitHub stars | ★ 166 | ★ 6,568 |
| First released | 2023 | 2018 |
| Replaces | LaunchDarkly, Optimizely | LaunchDarkly |
What are Abby and Flagsmith?
Abby
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.
- A/B testing
- Feature flags
- Conversion metrics
- Gradual rollouts
Flagsmith
Flagsmith is an open-source feature flag and remote configuration service that can be fully self-hosted. It supports segmentation, multivariate flags, and A/B testing analytics.
- Feature flags
- Remote config
- Segmentation rules
- A/B test analytics
Abby vs Flagsmith: key differences
Abby is written in TypeScript, while Flagsmith is built with Python. Licensing differs — MIT for Abby versus BSD-3-Clause for Flagsmith. Abby is the lighter option, starting around 512 MB of RAM against 1,024 MB for Flagsmith. Flagsmith is the more established project (first released 2018), while Abby arrived in 2023. Flagsmith has the considerably larger community, at 6,568 GitHub stars versus 166.
Why pick each one
Choose Abby if…
- Released under the MIT license
- First-class Docker support for quick deployment
- Written in TypeScript
- Lightweight — runs in 512 MB RAM
Choose Flagsmith if…
- Released under the BSD-3-Clause license
- First-class Docker support for quick deployment
- Kubernetes-ready with Helm charts available
- Mature project with 6.6k GitHub stars
Frequently asked questions
Is Abby or Flagsmith better?
Neither is universally better. Flagsmith has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Abby and Flagsmith free and open-source?
Yes. Abby is licensed under MIT and Flagsmith under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Abby and Flagsmith with Docker?
Abby: yes. Flagsmith: yes.
Which is lighter on resources, Abby or Flagsmith?
Abby has the smaller minimum footprint at 512 MB of RAM, compared to about 1,024 MB for Flagsmith. Real-world usage depends on library size, user count, and enabled features.