Is LaunchDarkly open source?

LaunchDarkly’s feature-flag platform is described as proprietary rather than open source because its central cloud-based control plane, which manages flag definitions, targeting, permissions, and audit history, is not available for inspection, modification, redistribution, or self-hosting under an open-source license. While LaunchDarkly publishes its SDKs and Relay Proxy under Apache License 2.0, these components depend on the hosted service, and the Relay Proxy primarily relays and caches configurations rather than replacing the control plane. The text argues that this distinction affects organizations needing deployment independence, source-code review, data-control options, or continuity plans, since they would need to migrate control-plane data if service access ended. It notes that LaunchDarkly offers regional and regulated hosted environments but not an on-premises platform edition, and contrasts this model with Unleash, whose server core is available under AGPL-3.0 and supports self-hosted, cloud, and hybrid deployment options, with some enterprise capabilities commercially licensed.

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