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We build mobile apps people love to use.

Kuatsu is a React Native agency for new products and existing apps. A senior team covers product strategy, design, engineering, launch, and every release after.

PassbaseExpensifyFrankfurtTeleDoctor24ESWESchleswig-HolsteinKFC

Work

TeleDoctor24

A telemedicine app that gives patients faster access to doctors.

okurimono.

A polished wish-list experience designed to feel simple, intuitive and fun to use.

Robben.App

A reporting app for the public that supports marine-mammal conservation along Germany's coast.

Services

Idea to App Store

We turn early ideas into focused products. Our team handles product strategy, UX and UI design, backend development, React Native engineering, testing, and store release. You get one experienced team from the first decision through the first production version. We keep scope, priorities, and technical trade-offs visible so the product stays focused from concept to release.

Existing Apps

We take over React Native apps that need steadier delivery, new features, or a technical reset. We can also add React Native to existing iOS and Android products without forcing a risky rewrite. We work incrementally, protect what already works, and leave the codebase easier to own. Your team can keep shipping while we reduce risk, modernize weak areas, and create a clear path for future releases.

AI Integration

We add AI where it makes the product more useful, not where it only adds novelty. That can include language, voice, vision, search, and recommendation features. We build evaluation, observability, privacy, and cost control into the production system from the start. Before we scale a feature, we test whether it is accurate, useful, fast enough, and affordable under real product conditions.

Performance Optimization

We profile the app on real devices to find the bottlenecks users actually feel. Then we improve startup time, rendering, lists, animations, and interactions, including native code where necessary. We measure again after each change so every claimed gain has evidence. You receive clear before-and-after measurements and a prioritized record of the changes, not vague optimization advice.

Field Notes

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Open Source

Our commitment to open source has a long history and we've been building the tools and libraries the ecosystem depends on.