Anyone who wears contact lenses knows the three eternal questions: how long have I been using them? How many are left? How much am I spending? Lenti Care answers all three: expiry dates per left and right eye, stock with reorder alerts, prescription history, expenses with charts.

It’s a 100% offline Android app: your medical data stays on your phone, full stop. No account, no server, no tracking.

A detail I’m proud of: the notification sounds aren’t audio files — the app synthesises them mathematically on first launch, wave by wave. Mostly because I could.