The Keystone App Audit
A senior engineer goes through your codebase for 5 to 10 days. You get a scored report, a prioritized fix plan, and straight answers. Fixed prices, published below.
Sound familiar?
“Every release breaks something new.” “The app got slower and nobody knows why.” “Our developer left. What did he leave behind?” “The agency says it is fine. I want a second opinion.” “We built it with AI in three weeks. Now nobody can change it without breaking it.” “The AI feature demoed great. In production it embarrasses us.”
If any of these sound like your app, the audit answers them with evidence.
The 5 lenses
Architecture and maintainability. Is the structure helping you or fighting you? How expensive will change be next year?
Code quality and tech debt. Where the debt is concentrated, what it costs you, and what is worth paying down.
Performance. Slow launches, janky scrolling, memory pressure: measured on real devices, located, explained.
Stability. Why it crashes, how to see crashes coming, and how to stop shipping them.
Delivery pipeline. Tests, CI/CD, release process: how fast and safely you can ship.
What you get
A scored report written in plain language, with the evidence behind every finding.
A prioritized fix plan: quick wins your team can do this sprint, then the strategic work, each with an effort estimate.
2 follow-up calls: one to walk through the report, one 2 to 4 weeks later to check on progress.
No lock-in. The report is written so your team can execute it. If you want it executed for you, the audit becomes phase one of a Remediation & Takeover engagement.
The rate card. AI-Codebase Audit: €2,900, 7 to 10 days, for AI-built or AI-assisted codebases. Mobile App Audit: €2,900, 7 to 10 days, for live iOS and Android apps. Emergency Project Analysis: €1,500, 5 days, for stalled or abandoned projects. Bigger scope (the app plus a full backend audit, a second app, a very large codebase) is quoted up front, never above €4,000.
The Mobile App Audit can include an EN 301 549 accessibility check. The European Accessibility Act has applied since June 2025, courts have started ordering companies to fix inaccessible apps, and most teams have no idea where they stand. Ask for the module when you book.
What happens after the audit. Most clients stop at the report, and that is fine: it is written so any competent team can execute it. When you want it fixed for you, the audit becomes phase one of a Remediation & Takeover engagement: €15,000 to €45,000, phased, each phase approved by you. After a rescue, a Stabilization Retainer (€2,500 to €6,000 per month) keeps the app healthy. I never quote a rescue before the audit: fixed prices on undiagnosed code are how apps end up needing rescues.
See it before you buy it
Download the sample report below. It is a real audit of the Wikipedia iOS app, a large human built codebase, in the exact format you would receive. For AI-built apps there is a second sample: the AI-Codebase Audit of Homelab, a real vibe coded app audited on the same 5 lenses. There is a third sample: the same app audited on Android. Same developer, same AI agents, and the problems land in different places on each platform.
What I need from you
Read access to the repository, and 30 minutes with whoever knows the app best. NDA? Fine. Send yours or use mine.
Questions you might have
What if the code is very old or partly Objective-C? I have worked in Swift and Objective-C codebases since 2017. Old code is normal. It is usually the reason an audit is needed.
Do you only audit iOS apps? iOS is my core and the biggest part of my work. I also audit Flutter, React Native, and native Android apps, and the backend behind the app.
What if you find nothing serious? Then you get something rare: a senior engineer confirming your app is in good shape, with evidence. That is worth having before your next investment or big feature.
5 to 10 days from when? From the moment I get repository access. You get the report on a call, not just as an email attachment.
How much does the audit cost? €1,500 for the Emergency Project Analysis, €2,900 for the AI-Codebase or Mobile App Audit, agreed before we start. Bigger scope is quoted up front and never above €4,000. That covers the full code review, the scored report, the prioritized fix plan, and both follow-up calls. The price does not change with what I find.
My app was built with AI. Is that a problem? No, it is half my work now. AI-built apps usually run fine in a demo and hide the same handful of problems underneath: no error handling, no tests, duplicated logic, and structure that breaks when you change it. The AI-Codebase Audit is built for exactly this.