21/01/2026
So I built VelocityTrack - basically a speedometer app that works for literally anything that moves. Started because I was always curious about train speeds but my phone's speedometer apps were trash.
Built with React Native because... well, I know React. Here's what I used:
Expo (obviously)
react-native-geolocation-service
SQLite for storing trips
MMKV for settings (so fast compared to AsyncStorage)
Firebase but only if users want cloud backup
What it does:
Shows your real-time speed in whatever unit you want
Tracks altitude and how fast you're climbing/descending (cool for flights)
Saves your trips with max speed, distance, all that stuff
Has a HUD mode that mirrors text for windshield projection
Works completely offline because I hate apps that need internet for basic features
Play Store: https://play.google.com/store/apps/details...
Need your feedback on this app friends!
