Impressive. It works surprisingly well in quiet rooms, especially on ceilings, only off by a few inches. I have a HTC Droid Incredible 2 and it has a rear facing speaker and 2 microphones, which makes it perfect for this app. For the only one of its kind this app is awesome.
Nice BUT unreadable On a high density screen, the distances are too small. Please enlarge the text size or put a setting for it. Tested on Galaxy Note 3.
Very good for what it is Given the obvious limitations imposes by the available hardware, the app performs very well. Of course this is a toy app, so you can't expect it to work as your expensive laser meter.
Almost awesome Very cool app, but the continuous mode could be smoother / faster
Impressive I recommend calibrating this app by placing your phone a known distance from a hard flat surface (a wall!). You can adjust the speed of sound until the results agree with the tape measure. (I had to boost mine up to 265m/s before I got sensible results). Then it becomes consistently accurate to within 1cm! Very very impressed. Not sure what I'll use it for, but I really like it. Cheers!
Very innovative! Works quite well in an uncluttered environment with big sound reflective walls. Would be interesting if it were possible to shape the ping into a more narrow beam, perhaps through beamforming or even beamstearing on a phone with stereo speakers
Update to most recent API (should not be noticable to most users)
An Adware Clean which detects apps containing inside or outside advertisements.