Contract test your APIs

Keep the promises you made to your consumers. Optic ensures your APIs are working as-designed by validating their behavior with real network traffic. It's snapshot testing for your API behavior.

✅ Seamlessly fits into your developer workflows and CI pipelines
✅ Ensure your API is always working as-designed
✅ Works just like your snapshot tests

Verify OpenAPIBook Demo
Product screenshot

Verify OpenAPI from test traffic

Accurate Documentation
Documenting existing APIs manually is error prone and time consuming. Optic makes the process easy and accurate.
Every Change Tracked
Run Optic in CI to make sure every change to your APIs gets documented
Connect your Test Suites
Use the traffic from your existing tests to document your API behavior.
Maintainable OpenAPI
Optic generates OpenAPI with $refs. Refactor it, add descriptions, etc. Optic is smart enough to never overwrite them.

5 minute demo

Install the CLI

npm install -g @useoptic/optic

Init a capture config and empty OpenAPI spec

optic capture init openapi.yml

Run test traffic and verify it against OpenAPI spec

optic capture openapi.yml

// What people are saying //

"We are set up to provide a great API and an amazing developer experience to our consumers. Realizing the promise of OpenAPI has always been hard. Optic's tools made it easier to get developers on-board and start fulfilling the promises of working API-first."
Gary Poster Senior Director Engineering
"To deliver a high quality API we need to be working API-first, and keeping track of the promises we have made to consumers. API-first has always been hard, Optic is the first tool we have found that makes it easy to quickly build and safety extend our APIs. "
Kostas Petrakis Lead API Engineer
"Brilliant! That's a whole lot of OpenAPI I don't need to write, and Optic is even making components to keep your OpenAPI Dry."
Phil Sturgeon Author, APIs you Won't Hate
"Anyone using (or wanting to use) OpenAPI to describe APIs should take a strong look at Optic. They truly get what it takes to maintain a great API at scale 🧑‍🍳🤌"
Marc-André Giroux API Lead
"Optic is a smart, simple, and straightforward solution to a real world problem every company faces"
Kin Lane API Evangelist

Add Contract Tests in minutes

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Want to learn more? Read the open source documentation