Hey Product Hunt 👋 I'm an AI engineer. On every team I've worked with, I've watched FE + BE try to "align on the API" the same way: a messy sync, a Notion doc nobody maintains, and Swagger auto-generated from code six months later that tells you what the API "is" but not what it was supposed to be or why. The result is always the same - onboarding takes weeks, integration bugs ship, and the next dev to touch the service spends a week just understanding it. Contractr is where FE + BE build the contract together and keep it alive: • Define endpoints + schemas collaboratively • Instant mock server so FE isn't blocked • Share link for PM/QA - no GitHub account needed • Comments + approval workflow on changes • Versioning with breaking-change detection • Request logs to see what's actually called vs. what was agreed The contract should be a living artifact the team owns - not a doc one person wrote and nobody maintains. Free: unlimited contracts + endpoints, 5-min mocks. Solo $19/mo: always-on mocks + share links + logs. Agency $49/mo: team RBAC + approval workflows. What's your team's "source of truth" for API contracts right now - and how honest are you being when you call it that?

Contractr

Spin up a mock API server in under 2 minutes - no backend.

Spin up a mock API server in under 2 minutes - no backend.