Show HN: Iterio – Study timer with spaced repetition built in

I built an Android study timer that solves two problems I had while studying for certifications: phone distractions breaking my focus, and forgetting what I studied a week later.

For focus: Three lock modes including "complete lock" that prevents unlocking your phone entirely until the timer ends. It even blocks Picture-in-Picture (that loophole we've all used to escape focus apps).

For retention: Automatic spaced repetition based on the Ebbinghaus curve. Tell it what you studied, and it generates review tasks at optimal intervals (1, 3, 7, 14, 30 days). No manual scheduling.

Also includes subject tracking, stats/heatmaps, encrypted cloud backup, and procedurally generated BGM.

Looking for beta testers—offering free Premium in exchange for feedback on what would make this more useful for your study workflow.

Beta signup: https://play.google.com/store/apps/details?id=com.iterio.app

Package: com.iterio.app | Android 8.0+ | Contact: iterio.timer.app.help@gmail.com