Split was a feature flag and experimentation SaaS acquired by Harness and now sold as Harness Feature Management and Experimentation (FME); these pages cover replacing it with self-hosted GrowthBook or Unleash.
Split, now Harness FME, against GrowthBook for teams that bought Split for experimentation: flags and A/B tests in one tool, warehouse-native analysis in GrowthBook versus Split's hosted metrics, the move into the Harness platform and quote-only pricing, and what GrowthBook's free self-hosted edition limits.
Split against Unleash for teams that mainly use Split for release flags rather than experiments: targeting and rollout strategies, self-hosted components (Split Proxy and Synchronizer versus Unleash Edge), governance features by edition and what moving into Harness changes for existing Split accounts.
Cost of ownership by component: Harness FME priced by quotation as a Harness Enterprise module against self-hosted GrowthBook or Unleash infrastructure, the warehouse queries experiments add, paid seats for SSO and approvals, migration work and ongoing operations.
Getting flag definitions, treatments and configurations out of Split or Harness FME with the Admin API and Harness's documented Python tools, the JSON and YAML outputs, and which targeting rules and segments have to be recreated by hand in GrowthBook or Unleash.
Moving flags and experiments from Split or Harness FME to GrowthBook: exporting flag definitions to JSON with the Admin API tools, recreating features and targeting in GrowthBook, rebuilding metrics on your warehouse, swapping SDKs and running both side by side until results match.
For teams that use Split mainly for flags and rollouts: exporting definitions with the Admin API, mapping treatments to Unleash strategy variants and segments, moving environments within Unleash Open Source limits, and choosing a separate tool for experiments.
What Split's move into Harness changes for customers: the switch to app.harness.io on migration day, FME sold as a module of the quoted Harness Enterprise plan, and how to weigh staying against moving to self-hosted GrowthBook or Unleash at the next renewal.
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