App Development
From idea to release, we handle app development for phones, tablets and desktops, native or cross-platform depending on what your project needs.
App Development
An app makes sense when people need to get something done on the go, regularly or directly on their device: logging jobs, working offline, using the camera or GPS. That’s why good app development starts with a question: is an app the right choice, or would a web application do the job?
We don’t just build apps for clients; we build our own. Better Window Switcher is a native 3D switcher for windows and browser tabs on macOS, sold as a one-time purchase. Krace is a rally-style co-driver app for Android that calls out upcoming corners, timed to your speed.
With these products we own the entire journey ourselves: concept, development, testing on real devices, release and maintenance. That experience goes into your app project, and we’re happy to run it in English or German.
At a glance
Apps written in Kotlin when performance, sensors or deep system integration matter. Our own app Krace taught us what GPS tracking and offline use demand in practice.
With React Native and Expo, one codebase becomes an app for iPhone and Android. That saves effort in both development and maintenance.
Software for Windows and macOS, such as tools for the office, warehouse or workshop. With Better Window Switcher, we brought a native macOS app written in Swift to market ourselves.
The servers, databases and APIs your app uses to sync data and connect to your existing systems.
We handle store listings, code signing and the review processes for Google Play and the App Store, or distribution inside your company.
New OS versions, changing store policies, bug reports: we keep your app current after launch.
Products
Our own products show how we work: from concept and development to release.
macOS 14 or later · native Swift
Every window and browser tab in 3D, one shortcut away.
Better Window Switcher replaces the macOS app switcher. Every open window and browser tab appears as a 3D card, and a few keystrokes take you straight to the one you need. Built natively in Swift, notarized by Apple, no account required, one-time purchase. More than 800 downloads since launch.
Launching 2026 
Android · native Kotlin
Know the road. Feel the drive.
Krace reads the road ahead and calls every corner out loud in rally style, timed to the speed you are actually driving. Plan routes in the app or import them from GPX files and Google Maps, then drive them offline on GPS alone.
Your staff log jobs, photos or readings on site, even without a signal. The data syncs as soon as they’re back online.
Bookings, orders or service requests in an app, with push notifications instead of email blasts.
Want to bring your own app to market? We help you define the scope of the first version and build it all the way to release.
Software that runs locally, talks to hardware or crunches large amounts of data, where a browser reaches its limits.
Step 1
We clarify your audience, core features and platforms, and whether an app or a web application is the better fit.
Step 2
We sketch screens and flows and agree on them with you as a clickable mockup before the heavy coding starts.
Step 3
You get test builds on your own device early and give feedback. Features are added step by step.
Step 4
We prepare the release and see it through store review or internal distribution at your company.
Step 5
Updates for new OS versions, bug fixes and new features, long after the first release.
FAQ
It depends on the project. React Native gives you one shared codebase for Android and iOS, which is the more economical choice for many business apps. Native development pays off when an app relies heavily on sensors, background processes or platform-specific features. We recommend whichever option fits your requirements and budget.
The main factors are the number of platforms, the feature set, whether you need your own backend and how many systems it connects to. App store review adds time as well. We recommend launching a first version with the essential features and expanding it based on real usage.
Platforms, features, design effort, backend and integrations, offline support and maintenance after launch. On top of that come the fees for Apple and Google developer accounts. After the free initial consultation, you receive a proposal with a fixed price for the agreed scope, itemized so you can follow it line by line.
We recommend publishing the app under your own developer account. You receive the source code and the usage rights to run and extend it; the details are set out in the contract.
Yes. Apple and Google release new OS versions every year and keep updating their policies. We keep your app compatible, fix bugs and build new features. We do the same for our own products.
The app requests only the permissions it actually needs and skips unnecessary tracking services. Data sent to a server can be stored in German data centers. We also help you prepare the privacy disclosures that Google Play and the App Store require. We’re happy to go through these points with you in person or, if you prefer, over a video call, in English or German.
Tell us about your idea in a free initial consultation, in person at your office in the Ruhr area or Düsseldorf, or over video if you prefer. We’ll tell you which platform and scope make sense for launch.