Speedometer is a speed measuring app that uses geolocation. It is a simple GPS Speedometer app that can be used while walking, running, on a bicycle or in a vehicle. All major units of speed are supported by the app.

KM/H - Kilometer per Hour
MI/H - Miles per Hour
KN - Knot
FT/S - Feet per Second
M/S - Metre per Second

This application is a Progressive Web App (PWA) and therefore can be installed for offline use. Being a PWA, the application is not dependent on or limited to a specific operating system, hardware or device type and can be used on almost all devices having a web browser and a GPS sensor. Moreover, it's totally FREE to use!