Independent app studio · Luxembourg

Small apps
with a backbone.

Kroun Studio builds focused, opinionated software for people who want their time back. No accounts, no ads, nothing that phones home.

Meet Sarge About the studio
  • Founded 2026
  • Luxembourg
  • iOS & Android

Work

What we're building

01 — Our first app

Sarge app icon — a flower-headed drill sergeant

Sarge

App blocker · iPhone & Android

The app blocker that doesn't take excuses.

Pick the apps that eat your day. Sarge locks them down with curfews, daily caps and unlocks you have to earn — ten pushups, counted by the camera, on your device.

  • Curfews and daily caps

    Lock an app at night, through the work day, or after thirty minutes. Group your worst offenders and rule them together.

  • Strict Mode

    Seal your rules behind a cooldown. Deleting the app or loosening a limit stops working until the timer runs out.

  • Unlocks you earn

    A wait, a phrase, a math problem, or real pushups. The camera counts reps on-device and records nothing.

Visit the Sarge site First week free, everything unlocked.
Sarge's roster of blocked apps, each with its schedule and daily cap
The Blocked apps screen in Sarge, with Strict Mode ready to seal the rules

The studio

Built small, on purpose.

Kroun is Luxembourgish for crown. We're a small, independent studio in Luxembourg, founded in 2026, making tools that take your side: software that does one job well, respects your attention, and keeps your data where it belongs.

01

Private by default

No accounts, no analytics, no servers. Our apps run entirely on your device — and the website you're reading sets no cookies, either.

02

One job, done properly

We'd rather ship a tool with a spine than a dashboard with forty settings. Every feature has to earn its place.

03

A person replies

Write to us and you reach the people who make the apps, not a ticket queue. Blunt, warm underneath — like Sarge.

Founded
2026
Based in
Luxembourg
Platforms
iOS & Android
Now building
Sarge

Contact

Say hello.

Questions about Sarge, press, partnerships, or you just want to talk shop — write to us. A person replies.

hello@krounstudio.com

Using Sarge and need help? support@krounstudio.com