Flagsmith vs Unleash
A side-by-side comparison of two self-hosted web analytics options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Flagsmith | Unleash |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 91 · Excellent | 94 · Excellent |
| Category | Web Analytics | Web Analytics |
| License | BSD-3-Clause | Apache-2.0 |
| Language | Python | TypeScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 1,024 MB | 1,024 MB |
| Deployment | docker, kubernetes, helm | docker, kubernetes, helm |
| GitHub stars | ★ 6,568 | ★ 13,822 |
| First released | 2018 | 2014 |
| Replaces | LaunchDarkly | LaunchDarkly, Split |
What are Flagsmith and Unleash?
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
Unleash
Unleash is an open-source feature management platform for controlling feature rollouts and running experiments. It is built for self-hosting with strong privacy and scalability.
- Feature toggles
- Gradual rollouts
- Experimentation
- Privacy focused
Flagsmith vs Unleash: key differences
Flagsmith is written in Python, while Unleash is built with TypeScript. Licensing differs — BSD-3-Clause for Flagsmith versus Apache-2.0 for Unleash. Unleash is the more established project (first released 2014), while Flagsmith arrived in 2018. Unleash has the considerably larger community, at 13,822 GitHub stars versus 6,568.
Why pick each one
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
Choose Unleash if…
- SDKs for many languages
- Simple Docker deployment
- Mature and well documented
Watch out for
- Some features enterprise-only
- Needs PostgreSQL
Frequently asked questions
Is Flagsmith or Unleash better?
Neither is universally better. Unleash has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Flagsmith and Unleash free and open-source?
Yes. Flagsmith is licensed under BSD-3-Clause and Unleash under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Flagsmith and Unleash with Docker?
Flagsmith: yes. Unleash: yes.