About · CS42.org

The experiments live in public. Some stay small — a quiz, a game, a calm corner to breathe in. The best ones grow into real products, like Sukoon and PunchTrack on iOS.

Nothing on this site is a mockup. If you can click it, it runs — the object detection is a real model in your browser, the multiplayer quizzes really connect players, and the apps are built in SwiftUI and shipped to the App Store.

What we build

Three things, done properly

Native iOS apps

Each app does one job properly — privacy first, offline friendly, built in SwiftUI.

See the apps

AI experiments

Live models running in the browser — object detection, calorie estimates, sketch recognition.

Try them

A playground

Quizzes, games, a piano, and calm tools. Quick to open, easy to put down, nothing to install.

Everything on CS42

How we work

A few things we hold to

Privacy first. On-device by default. We ask for data only when a feature genuinely needs it, and we say so plainly in the privacy policy.
One job per product. A tool that does one thing well beats a suite that does five things vaguely.
Built by hand. No page builders, no bloated templates. Fast pages, real code, English and Arabic with proper RTL support.
Ship, then listen. Experiments go out early so real use can shape what comes next.

Say hello

Working on something?

The studio behind this playground also takes on client work — websites and native iOS apps, from idea to launch. The first consultation is free.

Work with us hello@cs42.org