どこでも速度計

Simple Speedometer turns your iPhone into a real-time GPS speedometer — perfect for cars, trains, bullet trains, and airplanes.

KEY FEATURES

• Real-time speed display in km/h or mph
• Automatic unit detection based on your region (mph for US, UK, etc.)
• Manual unit switching in settings (Automatic / km/h / mph)
• Four measurement modes: Walking, Car / Train, Bullet Train, Airplane
• Analog and digital display options
• Speed meter with round-number scales for each mode and unit
• Maximum speed, distance, and elapsed time tracking
• Live speed graph over time (up to 10 minutes)
• Dark and light themes
• Portrait orientation with keep-awake display

BEST USE CASES

• Track your speed on road trips or commutes
• See how fast your bullet train is moving
• Measure walking or running pace
• Check your airplane's cruising speed

PRIVACY FIRST GPS data is used only for on-device speed calculation. Nothing is transmitted or stored externally. No account required, no ads.

NOTES Speed accuracy depends on your device's GPS signal quality. Works best outdoors or near windows. Distance is measured in km (metric) or mi (imperial) based on your selected unit.