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Your API docs say one thing. Your API does another.

SpecDrift watches your OpenAPI spec against real endpoint behavior and tells you — in plain English — exactly what changed, when, and whether it's safe to ignore.

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openapi.yaml — /v1/invoices/{id} detected 4m ago
responses: 200: properties: amount_due: type: integer - currency: string status: type: string
responses: 200: properties: amount_due: type: integer + currency: string + tax_amount: integer status: type: string
Explained

Live response now includes `currency` and `tax_amount` on `GET /v1/invoices/{id}` — your spec was never updated. This is additive and won't break existing clients, but any consumer parsing this response strictly (e.g. JSON Schema validation) will start seeing unexpected fields. Recommend: update the spec, no client action required.

The problem

"Wait, when did that field get added?"

Someone on the backend team ships a fast-follow change directly against the handler. The spec doesn't get touched. Three weeks later a partner integration breaks in a way nobody can explain without grepping git blame across two repos.

"Is this drift safe to ignore?"

Contract-testing tools catch drift in CI — once. Nothing watches continuously in production and tells you, in language a human can act on, whether a given change is breaking, additive, or just noise.

How it works

Three moving parts. No dashboard you have to remember to check.

01

Point it at your spec

Connect your OpenAPI file (repo or URL) and the live base URL you want monitored. Five minutes, no code changes.

02

It watches continuously

Scheduled checks compare real responses against the spec and keep a history of every drift event, not just the latest one.

03

You get an explanation, not a diff dump

Every drift event ships with a plain-English summary of what changed, why it probably happened, and whether it's breaking — as a PR comment, Slack message, or email.

Pricing

One plan. Nothing to configure.

$29 / mo per API
  • Unlimited drift checks, hourly
  • Slack, email, and GitHub PR-comment alerts
  • Full drift history, not just the latest event
  • One connected spec + live endpoint

Stop finding out about drift from a support ticket.

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