Open-source CLI that detects API contract drift — spec-vs-reality and spec-vs-spec breaking changes.
github.com/Haswell119/driftwire
DriftWire answers the two questions that break API integrations: does my live API still match its OpenAPI spec (driftwire check), and did I introduce a breaking change between two spec versions (driftwire diff). The free MIT core runs locally and in CI with zero dependencies beyond PyYAML. Pro (one-time) adds HTML drift reports and a .driftwire.yml waiver config so teams can approve known drift while still blocking new drift. Built by Meridian Digital.