API Preflight
Mock the API before the backend exists.
Define endpoints and the exact responses you want — 200, 404, 500, custom bodies, delays, whole sequences — and get a live URL your mobile or web app can call today. Build and test the frontend against every response the real backend can't hand you on demand.
Create an instant project →No account needed.
Three ways to address a project.
Every project answers on a path-based URL the moment you create it — apipreflight.io/m/{id}/users/1. Pro adds a subdomain of your own, yourteam.apipreflight.io, and your own domain, mock.yourcompany.com, with the HTTPS certificate handled for you.
- Free, no account — one endpoint, an instant public URL, gone after 7 days.
- Free account — projects saved for good: up to 3 projects, 10 endpoints each, and a log of recent requests.
- Pro, US$9/month — scenarios and response sequences, generated data, stateful endpoints so a POST is there in the next GET, an MCP server so Claude, Cursor or VS Code can drive a project while it writes your code, a management API so your CI can make its own mock for each run, proxy passthrough to your real API, OpenAPI import and export, and your own subdomain or domain.
- Teams, US$25/month — shared projects for your whole crew. Flat, not per seat: add anyone, no extra charge.
Full detail on pricing.