Apps that
move you
forward.
Mobile apps that change behavior. Small studio. Real products. Built to last.
78/100
Sleep protection score
Built with purpose.
Every app solves one real problem.
CaffCurve
Track your caffeine. See the decay curve. Sleep better. CaffCurve shows you exactly what caffeine is doing in your body, hour by hour, so you know what to do about it.
More apps in the works.
Small studio. Serious products.
No investors to impress. Just apps people actually keep on their phones.
One problem. One app.
Each app solves exactly one problem, and solves it well. No feature bloat, no scope creep.
Evidence, not guesswork.
Features are built on published research and tested in real use, then improved based on what actually works.
Built in Switzerland.
Privacy-first by default. Clean code. Long-term thinking. No shortcuts.
One developer. Full stack.
JappJ Studio is a one-person app studio based in Switzerland. I design and build iOS apps that solve real problems, then market them with the same systematic thinking I use to write the code.
Every app is designed to change one behavior, and built to last, priced fairly and shipped without compromise.
Interested in a partnership or an acquisition, or just want to say hello?
Track your caffeine. Sleep better tonight.
1-week free trial, then $4.90/month or $39.90/year.
Coming soon to the App StoreNo account needed · Cancel anytime in your Apple ID settings