Your speedometer tells you how fast you're going. This one tells you what going faster actually buys you — and it's less than you think.
One glance shows your speed, your pace in min/km, and the number no dashboard shows: how many seconds per kilometer you'd gain by driving 10 km/h faster. At bicycle speed, plenty — the digits glow amber. At 80 km/h? Five seconds per kilometer, and the display fades to gray to match. Underneath, in red, what that trade really costs: at 80, pushing to 90 adds 27% to your braking distance for those five seconds.
No app store, no account, no tracking, no ads. One HTML file that runs in the browser you already have, using nothing but your phone's GPS. Open it, press start, mount the phone, and watch the case for speeding evaporate in real time.
The math has always been true. Now it's on your dashboard.
Time Saved Per KM