PromptMatrix pulls hardcoded prompts out of your codebase into a single governed registry. Non-engineers propose changes in plain text. Engineers review a line-by-line diff and approve. Approved content goes live in 10 seconds — zero redeploy, ever. Built for multi-agent systems and AI pipelines. Works with any LLM API. ✓ Approval workflow + immutable audit trail ✓ 1-click rollback ✓ Browser / SQLite / self-hosted ✓ MIT licensed — free forever ✓ Founder tier: $499 lifetime, 100 orgs hardcapped