I built Time Stopper Master, an Android app designed to test and train your internal sense of time. The goal is simple: start the timer, count in your head without looking, and stop it on an exact millisecond target (e.g., 5.00 seconds). The Problem It Solves: Most timer or reaction apps focus purely on quick taps (reflexes). I wanted to build something focused on rhythm and internal time perception—a clean, distraction-free tool with precise score tracking, combos, and difficulty scaling. Key Features: Current Stage & Tech: Built natively for Android using Kotlin. It’s fully live on the Google Play Store. Try it out here: Google Play Store Link I’m actively working on the next update. I’d love your thoughts on:   submitted by   /u/sirerickoh [link]   [comments]