Karim Hossenbux · one-person studio · Barcelona
One person.
Whole apps.
Shipped.
I have been building apps solo since 2016, designing, shipping and running them from idea to App Store. Some have a handful of users, some have many. All of them are real, live and maintained.
ls apps
Peekabop
Every song. Every word. Right under your camera.
Lyrics live in another tab, a scrolled-away video description, or nowhere at all. Peekabop puts whatever you are playing on your Mac right under the camera, lighting up word by word as it is sung.
// Native macOS menu bar app in SwiftUI: on-device speech matching for music videos, sixteen karaoke effects.
open chewingcode.com/peekabop
Runtile
Your running, all in one place.
Runners use ten different watches and apps. Runtile reads Apple Health and turns every run into a colourful year of tiles, records and shoe mileage.
// Native iPhone app, entirely on-device, with widgets and shareable story cards.
open runtile.app
Dayjavu
A video diary you already filmed.
Your camera roll is full of moments you never rewatch. Dayjavu picks a few seconds from each day and stitches them into a diary you will actually play.
// Native iOS app with on-device video processing. Featured on Product Hunt.
open dayjavu.app
Cardwatch
Never miss a TCG drop again.
Collectors were refreshing hundreds of European shop pages by hand. Cardwatch watches them all and pings you minutes after stock lands.
// Crawlers across 500+ retailers in 8 countries, a web app, and free Telegram and Discord alert channels.
open cardwatch.eu
Moonitor
A crypto portfolio that stays on your machine.
Most trackers want your API keys and your data. Moonitor stores every transaction locally, no account, no tracking, on every desktop and on iPhone.
// Cross-platform desktop app for macOS, Windows and Linux, plus a native iOS companion.
open moonitor.io
LilMoon
Bitcoin, glowing on your desk.
A tiny Bitcoin widget for the Mac desktop and menu bar, with retro CRT presets, fee data and price alerts. Built for fun, shipped for real.
// Native macOS widget and menu bar app.
open moonitor.io/lilmoonOpen to
three things.
A role
Senior engineer on a product team that ships, native, full-stack or founding. I ship in week one and still own the decisions and the bugs.
Email meA client
Your app or MVP, built end to end by the person who will also answer the phone.
Tell me about itA partner
Cofounding something, or adopting one of the apps above and taking it further together.
Say hiWorking together
The first month,
week by week.
Week 0
A call
Thirty minutes. You describe the problem, I tell you honestly whether I am the right person.
Week 1
A working prototype
Something real on your phone or in your browser. Rough, but it runs.
Every week after
A shipped build
A TestFlight or a deploy every week, with a short note on what changed.
Got something
to chew on?
// I read everything.