Keystone Systems

Was your app built fast, maybe with AI tools, and now it is slow, crashing, or expensive to change? We find out why, with evidence, and give you a plan your team can act on.

Most of our work starts with a fixed-price app audit. We read your codebase and your app and deliver a scored report across five lenses: architecture, code quality, performance, stability, and delivery pipeline. You get the real risks, what each one costs you, and a prioritized fix plan with effort estimates. No lock-in. Your own team can run with it, or we carry out the plan as a fixed-price rescue project.

We audit AI-built and vibe coded apps as well as hand-written ones. iOS first, plus Flutter, React Native, native Android, and the backend behind the app. Every audit is done personally by a senior engineer with 9+ years of experience. Read real sample audits, including the same app audited on both iOS and Android, at keystonesystems.eu/audit.