Apps

From idea to your phone

A look at the mobile apps I'm building, each at its own stage, all made end to end.

An Ironbor workout in progress, with each exercise and its remaining sets listed and the rest timer running in the corner

Live on App Store

Ironbor

When you're between sets, the last thing you want is to wrestle with your phone. Tap your reps in, glance at the rest timer on your lock screen, and stay in the workout. Ironbor quietly keeps score: your routines, your records, and the streak you won't want to break.

For trainingBuilt around the daily gym flow: log sets fast, rest clearly, keep moving.
On the Lock ScreenThe rest timer runs as a Live Activity — glance at it, don't unlock.
For health dataApple Health where it earns its place: workouts go out, body weight comes back.

iOS 26+ · iPhone · German App Store · Freemium

About Ironbor

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Wortschatzi's deck list, one row per topic from the course with the number of cards waiting for review

Live on App Store and Google Play

Wortschatzi

Professional German is hard enough without the exam nerves. Wortschatzi takes the vocabulary from the B2 Beruf course and helps the words you almost know finally settle in, a few honest minutes at a time. Flash cards, quick quizzes and writing practice, in your own language, online or off.

For learnersVocabulary practice shaped by real B2 Beruf preparation, not a generic flash-card clone.
For growthBuilt cross-platform from day one and now shipped on both stores, with a monetization path.

iOS 26+ · iPhone · Android 7+ · Freemium

About Wortschatzi

(opens in a new tab)

LifeSignal's daily check-in screen, with the day streak and the two check-in buttons

Live on App Store

LifeSignal

A gentle daily check-in for the harder stretches. One tap to say you're okay, and if a day slips past without one, the people you've chosen quietly hear about it. No alarms, no surveillance, just a steady thread to people who'd want to be there. I built it from something I lived through, and it's on the App Store today.

For youOne tap a day, and a small win when the day is hard.
A safety netMiss a check-in, and the people you trust are gently told.
On your termsNo account, no tracking. Dignity over surveillance.

iOS 26+ · iPhone · Worldwide · Free

About LifeSignal

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Community collaboration

From its design to every release.

DüsselQueers App

Together with Shameel Faraz (opens in a new tab) I develop and maintain the app for International LGBTQ+ Düsseldorf (opens in a new tab), from its design to every App Store release, which I publish from my own account.

Free on the App Store (opens in a new tab)

Open for collaboration

Have an app in mind, or one to look after?

I'm a senior mobile engineer based in Düsseldorf. I build iOS and Android apps end to end, and help keep existing ones healthy and shipping. Open to work across the EU and beyond, including the US and Canada. If you're shaping something, I'd love to hear about it.

Get in touch