Is GrowthBook open source?

GrowthBook and Unleash are both open-core platforms, but they differ in licensing, deployment architecture, feature-flag capabilities, and what is included without a paid license. GrowthBook’s core is MIT-licensed, while enterprise code is published in the same repository and Docker image under a commercial license; it is centered on warehouse-native experimentation and commonly relies on MongoDB, though FerretDB with PostgreSQL offers an alternative open-source stack. Unleash provides an AGPL-licensed server with Enterprise distributed separately, uses PostgreSQL directly, and focuses primarily on feature flags. The comparison argues that Unleash’s free open-source edition includes role-based access controls, server-side evaluation for frontend clients, an evaluation playground, exportable instance-wide audit logs, and built-in usage metrics for flag lifecycle management, whereas GrowthBook places several comparable capabilities behind Pro or Enterprise tiers. It also contrasts GrowthBook’s default client-side delivery of full targeting rules with Unleash’s evaluated frontend responses, and notes that self-hosted GrowthBook can send telemetry and, for licensed deployments, perform license-server checks, while Unleash can disable version and usage reporting and operate licenses offline.

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