Free app · iPhone and Android · riders 14+
Revspoke makes any bike sound like an engine. A Bluetooth speed sensor on your back wheel tells your phone how fast you're going, and Revspoke revs, shifts and idles exactly as you ride.
App Store · coming soonGoogle Play · coming soon

Strap a Bluetooth speed sensor round the hub of your back wheel. It takes a minute and needs no tools. Tested sensors.
Open Revspoke, spin the wheel to wake the sensor, then tap it in the list. The app remembers it.
Pick an engine, press Start engine and ride. It shifts up near the redline, crackles, and drops to idle when you stop.
It works with the phone in your pocket and the screen locked. Play it through the phone's speaker or a Bluetooth speaker. No sensor yet? The app has a demo ride so you can hear it first.
Watch the road. Keep it loud enough for you, not for the street. Wear a helmet. Don't use it where sound or phones aren't allowed. It's an engine sound, not a safety device, and it won't make you any more visible or audible to traffic.