How to Migrate from LaunchDarkly to Unleash

Teams commonly migrate from LaunchDarkly to Unleash to reduce licensing costs, gain self-hosting options, and keep user data within their own infrastructure. The recommended process has five phases—planning, piloting, migrating, cutting over, and onboarding—and encourages teams to create new flags in Unleash, remove obsolete flags, and migrate incrementally while both platforms run in parallel. Most concepts map directly between the platforms, including targeting rules, segments, multivariate flags, percentage rollouts, dependencies, and proxy services, while flag definitions can be exported from LaunchDarkly’s REST API and recreated through Unleash’s Admin API or JSON import tools. Application changes generally involve replacing LaunchDarkly SDK calls with Unleash equivalents, potentially through an abstraction layer or OpenFeature provider to minimize disruption and compare evaluation results before switching traffic. Important differences include instance-wide flag-name uniqueness in Unleash, different hashing algorithms that reassign users in partial percentage rollouts, polling rather than default streaming for updates, and distinct archived-flag and default-value behavior. Individual teams may become productive within days, although completing a full migration of legacy flags can take weeks or months until LaunchDarkly receives no evaluation traffic.

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