GrowthBook

GrowthBook is an open-source feature-flagging and A/B testing platform that empowers companies to release code and measure impact using their own data infrastructure. By natively integrating with SQL-based warehouses, Google Analytics, Mixpanel and other sources, it supports experimentation across web, mobile, ML, and email channels without requiring an in-house build. Its lightweight SDKs, fast statistics engine, and transparent result export to SQL or Jupyter notebooks make experimentation accessible to both developers and data teams. Backed by Y Combinator and top VCs, GrowthBook offers a secure, PCI-compliant solution that preserves data sovereignty while capturing institutional knowledge in a searchable test library.