Detect API contract drift before your users do.

One CLI, two problems solved

Install

# single-file wheel (no build step)
pip install "https://github.com/Haswell119/driftwire/releases/download/v0.2.0/driftwire-0.2.0-py3-none-any.whl"

# or from source
pip install git+https://github.com/Haswell119/driftwire.git

# macOS (Homebrew)
brew tap haswell119/driftwire
brew install driftwire
# Python 3.9+. Only dependency: PyYAML.

Use it as a CI gate

# 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 check

Also ships as a GitHub Action (Haswell119/driftwire@main) — drop it into on: [pull_request] and it gates merges automatically.

Pro — one-time $29

The free core stays free, forever. Two features are licensed:

• HTML reports — --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.

Why DriftWire

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.

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