ConfigCat is a feature flag service. It allows developers to control their features by easily turning them on or off even after the code is deployed. With ConfigCat, teams can target user segments based on attributes such as region, email, or subscription. The service supports rollouts, A/B testing, and variations. It also acts as a hosted service for feature flag and configuration management, allowing feature releases to be decoupled from code deployments.ConfigCat provides open-source SDKs for easy integration with various platforms, including mobile, desktop applications, websites, and backend systems. The service is trusted by teams of all sizes, including well-known companies like Microsoft, Nasdaq, Rakuten, and Schneider Electric.