Speedometer One vs Tachys

Speedometer One is a clean, minimal GPS speedometer designed for clarity and focus. No ads, no tracking, no subscription — just your speed, beautifully displayed. Built for drivers, boaters, cyclists, and anyone who needs to know how fast they're moving. One screen. One number. Always glanceable. FREE FEATURES Real-time GPS speed display Speed unit toggle: mph, km/h, or knots Arc gauge that responds to your speed Apple Watch companion app — free, no purchase needed No ads, no tracking, no data collection PRO FEATURES — ONE-TIME PURCHASE Max speed tracking with haptic feedback at peak speed Real-time elevation in meters or feet Compass heading with smooth live rotation Bearing direction — cardinal and degrees Night mode — aviation red display for dark environments Unlock once, yours forever PRIVACY FIRST Your location is used only to calculate speed. Never stored, shared, or sold. No account required. No sign-in. No data collection of any kind. APPLE WATCH Speed on your wrist, completely free. Tap to cycle between mph, km/h, and knots. No purchase required. ONE-TIME PRO UPGRADE $2.99. No subscription. No monthly fees. Pay once, own it forever.

Tachys is a GPS speedometer built for the moments when you want one clear, readable number—on the road, on a train, on a bike, on foot or in the air. JUST OPEN AND GO Tachys measures automatically. It combines GPS and motion data, filters unreliable fixes and detects whether you are walking, cycling, driving, traveling by train or flying. Choose km/h, mph or knots. HONEST WHEN GPS DISAPPEARS In a tunnel or during a signal outage, Tachys never silently drops to zero or freezes a number. It dims the last known speed and shows how long the signal has been missing. AT A GLANCE • Digital LED display and a minimal arc view • Maximum and average speed, moving time, distance and altitude • Target speed with a clear reached milestone • Live Activity for the Lock Screen and Dynamic Island • Home Screen widget and quick launch from system controls YOUR TRIPS, YOUR DATA Tachys records trips locally on your iPhone. Tachys Pro unlocks history with speed charts, route maps and replay, plus GPX and CSV export and shareable trip cards. ON YOUR WRIST The Tachys Pro Apple Watch app uses the Watch’s own GPS. Measure away from your iPhone; completed trips transfer back when the devices reconnect. PRIVATE BY DESIGN There is no Tachys account, backend, advertising or automatic upload to us. Location and trip history are processed locally unless you choose to export or share them. The speedometer, current trip data and Live Activity are free. Tachys Pro is a one-time purchase for history, export and the Apple Watch app. No subscription. Tachys is not a certified navigation or vehicle instrument. Stay aware of your surroundings and follow local laws.