A free, zero-dependency CLI that answers the two questions that silently break API integrations: does my live API still match my OpenAPI spec, and did I just introduce a breaking change?
driftwire check — spec vs. realityProbe your live API and validate every response against your OpenAPI spec. Flags type mismatches, undocumented fields, missing required fields, and enum violations. The one thing oasdiff explicitly cannot do.
driftwire diff — spec vs. specCompare two spec versions and surface the breaking changes: removed endpoints, fields, and parameters; newly-required fields; type changes; removed enum values.
pip install git+https://github.com/Haswell119/driftwire.git
# Python 3.9+. Only dependency: PyYAML.# catch breaking changes on every PR
driftwire diff openapi@base.yaml openapi.yaml
# or validate a deployed API against its spec
driftwire check openapi.yaml --url https://api.example.com
# exit 1 when drift is found — fails the build like any other checkAlso ships as a GitHub Action (Haswell119/driftwire@main) — drop it into on: [pull_request] and it gates merges automatically.
The free core stays free, forever. Two features are licensed:
--format html renders a self-contained, severity-colored report you can attach to a PR..driftwire.yml waivers — record reviewed-and-justified exceptions so CI stays green on known drift while still blocking new drift. The workflow oasdiff sells for $100/mo.Most API tooling does one half of the job or the other. DriftWire does both in a single, dependency-light CLI that runs locally and in CI — no uploads, no telemetry, no account. Your spec and your responses never leave your machine.
Built by Meridian Digital. MIT free core · source on GitHub · releases · listed on ListedStartups.