dif.sh

Dif.sh is an open source feature flag and A/B testing tool where every flag is a markdown file living alongside the code it controls. Flags document what they do, why they exist, and the decisions made about them, and changes are reviewed in pull requests like any other code change. A coding agent can install Dif in one command with no account required, and the tool optionally supports sending events to your own analytics or using Dif Cloud to read results and record decisions in the flag files.