The independent audit layer for AI-built software
A 5-star freelancer can still ship code that quietly breaks your business.
AI-built apps demo perfectly — then rot underneath: security holes, unmaintainable code, logic that doesn't do what was promised. Star ratings can't see any of it. ProofStack audits the code itself, with evidence you can inspect.
Works on top ofUpwork, Fiverr, or a direct hire. We don't replace where you find talent — we verify what they actually ship.
The supply exploded. Verification didn't.
AI drove the cost of building an app toward zero — and drove the cost of knowing whether you can trust it through the roof.
of all new code is already AI-generated — and on track for 60% by 2026. Who audits it?
of vibe-coding builders are non-developers. They have no way to know if their own code is safe.
of 380,000 AI-built apps were found exposed with no authentication — 40% of them held sensitive data.
CTOs reported a production disaster caused by AI-generated code that demoed fine.
Figures from public 2025–26 vibe-coding research (Gartner, Escape.tech, Stack Overflow, CTO surveys).
What we objectively measure
Problem-Solving Fidelity
Did it actually solve the defined problem — with the hard parts handled, not just a demo that looks done?
Code Quality
Structure, readability, tests, and maintainability — scored from the actual source.
Code Integrity
Commit patterns, contribution consistency, and hands-on familiarity — verified against the actual codebase. AI tools are fine; ownership of the result is what counts.
Live Behavior
We open and test your deployed app — real behavior, real performance, real UX.
Security
Secret leaks, CVEs, and dependency risks — so clients can trust you with their data.
Trust is measured, not claimed
Submit
GitHub repo, live URL, zip, or portfolio — one source is enough to start.
Auto-analyze
Specialist agents score each dimension with evidence, then a validator cross-checks to catch hallucinations and unsupported scores.
Deterministic score
The overall score is computed by a fixed, published rule from evidence-backed dimensions — not model guesswork. Same evidence, same score.
Our scoring is an open, versioned standard (v0.1): fixed weights, deterministic aggregation, and per-dimension evidence you can inspect. It's an independent assessment — a snapshot you can verify, not an accredited certification or a guarantee. Not a certification authority? — why that's the stronger position →
Stars measure satisfaction. We measure the code.
Upwork and Fiverr ratings are real — but they answer a different question than the one that sinks an AI-built app.
Platform stars tell you
The client was happy. Communication was smooth. Something got delivered, on time.
They can't tell you
Is it secure? Maintainable? Does it actually do what the spec said — or just demo like it does? The things that break a vibe-coded app in production.
ProofStack is the missing layer
Independent, evidence-backed, and portable — on top of wherever you hired. We don't take a cut of your hire, so the only thing we optimize for is the truth.
For clients & hiring managers
Already hired someone? Audit what they shipped.
You found a developer on Upwork, Fiverr, or through a referral — that part works. Before you bet your business on the code they delivered, get an independent, evidence-backed audit: code quality, security, live behavior, and whether it truly does what was promised.
🛡️ We don't take a cut of your hire. We're an independent verifier — so the only thing we optimize for is the truth.
Free during beta · Full evidence report included