[z01d]

What's the difference to sonar ruler? http://itunes.apple.com/de/app/sonar-ruler/id324621243?mt=8

All codes are taken :-(

[greenale]

AFAIK Sonar Ruler works by reflecting the sound off a wall e.g.

My app supports a dual-device mode where you can measure the distance between two iOS devices, and it works reliably up to 25 meters.