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 and GrowthBook are closely matched on ownership (89 vs 83) — this one comes down to pricing and to which trade-offs below you can live with.
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
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Unleash | GrowthBook | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 89 | 83 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | 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. |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 2 GB | 4 GB |
| Realistic running costWhat the box costs each month if you run it yourself. | $12–24/mo plus Postgres, against per-seat feature-flag pricing | $20–35/mo, against LaunchDarkly pricing that starts high and scales per seat and per MAU |
| Setup timeHonest first-install estimate, not the marketing quickstart. | 1 hour | 2 hours |
| Ongoing maintenanceThe part nobody budgets for. | Low. | Low to moderate. |
Unleash is Macrostack's recommended LaunchDarkly alternative, so it's our pick here.
Weighing both against staying on LaunchDarkly? Is LaunchDarkly free? What it actually costs →
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
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Unleash
if a lower exit cost matters more to you than any single feature, and closest feature parity with LaunchDarkly of anything open.
Choose GrowthBook
if genuine statistics engine — Bayesian and frequentist, not a toggle with a chart.
Neither, yet
if both carry a real cost you should weigh first — aGPL-3.0 is strong copyleft — read it before you modify and redistribute, and enterprise directories are carved out of the MIT licence. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
Unleash vs GrowthBook — common questions
Is Unleash a better fit than GrowthBook for feature flags & experimentation?
It depends on what you are optimising for, and the honest split is this: Unleash scores 89 to GrowthBook's 83 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. GrowthBook earns its place on a different axis — genuine statistics engine — Bayesian and frequentist, not a toggle with a chart. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Unleash keeps its data local or in open formats, so leaving is an export rather than a negotiation. GrowthBook is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host Unleash or GrowthBook?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are Unleash and GrowthBook both alternatives to LaunchDarkly?
Yes — both appear in our LaunchDarkly comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off LaunchDarkly and now choosing between the two replacements, which is a narrower and much easier question.
Related alternative guides
Facts verified 2026-07-31. Licenses and pricing change — spotted something out of date? That's a correction we want.