Unleash vs GrowthBook
Both are alternatives to LaunchDarkly. Here's how they stack up — verified facts, no spin.
Also searched as GrowthBook vs Unleash — same comparison, one verdict.
Unleash
TOP PICKThe most complete open feature-flag platform, and it self-hosts properly.
Unleash is the closest open equivalent to LaunchDarkly: gradual rollouts, user targeting, segments, environments, custom activation strategies and a genuinely good admin UI. Its architecture is the detail that matters most in production — SDKs evaluate flags locally from a cached configuration, so an outage of the Unleash server does not take your application down with it, which is not true of every platform in this category. AGPL-3.0 with around 13.7k stars, self-hostable with Docker, and an enterprise tier for organisations that want support and advanced governance. Note the licence: AGPL is strong copyleft, which matters if you intend to modify it and offer it as a service.
GrowthBook
Flags plus a real statistics engine — the experimentation answer.
GrowthBook is the option to look at when the reason you want flags is experiments rather than toggles. It runs A/B tests against your existing data warehouse — Snowflake, BigQuery, Redshift, Postgres — so the analysis happens where your data already lives instead of in a second copy, and it offers Bayesian and frequentist statistics rather than one opinionated method. Around 8.1k stars. The licence needs stating precisely: the core is MIT, but three enterprise directories are carved out under a separate commercial licence, so it is MIT-with-exceptions rather than plain MIT.
Side by side
| Unleash | GrowthBook | |
|---|---|---|
| Sovereignty Score | 89 | 83 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first | Yes | Yes |
| License | AGPL-3.0 (open core; enterprise tier is commercial) | MIT core, with enterprise directory carve-outs |
| Pricing | Open-source server free and self-hostable. Hosted and enterprise tiers are paid. | Self-hostable core free. Cloud and enterprise tiers are paid. |
Unleash is Macrostack's recommended LaunchDarkly alternative, so it's our pick here.
Unleash
Strengths
- +Closest feature parity with LaunchDarkly of anything open
- +Local SDK evaluation — your app survives an outage of the flag service
- +Mature, with a decade of production use behind it
- +Strong Kubernetes and Docker deployment story
Trade-offs
- −AGPL-3.0 is strong copyleft — read it before you modify and redistribute
- −Some governance and advanced features sit in the paid enterprise tier
- −No experimentation engine on the level of LaunchDarkly's
- −Self-hosting means running a server and a database you now own
GrowthBook
Strengths
- +Genuine statistics engine — Bayesian and frequentist, not a toggle with a chart
- +Runs experiments against your existing warehouse, no data duplication
- +Warehouse-native means no second source of truth to reconcile
- +Self-hostable with a real free path
Trade-offs
- −Enterprise directories are carved out of the MIT licence
- −Heavier to set up than the pure flag tools — you need a warehouse
- −Flag management is less polished than Unleash's
- −Overkill if you only want to turn features on and off
Related alternative guides
Facts verified 2026-07-31. Licenses and pricing change — spotted something out of date? That's a correction we want.