Tiden

Tiden keeps your product intent as versioned specs that branch and merge like code. When a coding agent — Claude Code, Cursor, Copilot or Codex — starts a session, it works from a living contract of what the product should do.

Every promise maps to a test. The session cannot close while a promise is open. On every merge, Tiden drafts spec updates even for changes that skipped it, so the record stays current.

Code review stays with your reviewer; Tiden adds a second verdict showing what was promised and what was proven. Each release gets a coverage score by component, and production errors trace back to the exact release.

Built by the team behind Qase, a testing platform used by over two thousand teams. Fourteen-day free trial, then forty-nine dollars a month for one product.