I wanted to find an iPad game where my 5yo could learn math, which sounded simple.

Turns out most kids' educational apps are... shady. Notifications, streak mechanics, ads for games definitely not meant for children, coin systems and flashy rewards designed to maximize engagement rather than learning.

So I decided to vibe code something for her.

The result is Lumi. It's a simple math app with: - No ads, no accounts, no tracking - No notifications - No coins, streaks, or variable reward nonsense - Daily limits (because kids should go play outside) - Works offline, stores everything locally - Supports English, Portuguese, German, French (more to come)

My daughter has been using it for a while now and actually enjoys it. The problems adapt to her level, and when she hits the daily limit, it just tells her to go do something else.

It's completely free and open source. I built it for her, but figured other parents might find it useful too.

https://playlumi.app/ https://github.com/matheusml/lumi

Happy to answer questions about the tech stack (SvelteKit, TypeScript), decisions, or anything else