iPhone Screenshots


Batphone is a research tool which demonstrates a method determining your location within a building. It's meant to be an alternative to GPS or iBeacon, and it works by using the microphone to record room ambience. These acoustic room fingerprints are used to recognize previously-tagged rooms when they are revisited. For comparison, it also shows the position retrieved from Location Services, which determines your coordinates using radio signals from GPS satellites, wifi and cellular base stations. Our experiments have shown that Batphone's acoustic method is more accurate than the radio method. Try it for yourself and let us know what you think!

Fore more details, please see the report titled "Indoor Localization without Infrastructure using the Acoustic Background Spectrum" which was presented at the 2011 MobiSys conference.

What’s New

Version 1.4

Fixed iOS 10 compatibility issues.

Ratings and Reviews

The Blue Indian ,

Dude, this app is no bogus!

I tested it on my mom's bedroom, and then on mine: to me, both have almost exactly identical acoustics. However, Batphone was super-easily able to tell tge difference, even in complete silence! I infinitely highly recommend it!

goorioles747 ,

It works!

I was a little bit skeptical at first, but I tried it and it honestly worked... Really really impressive!

ossito2012 ,


don't quite see the point of this, I thought this could be used to track other phones, location of a specific talker in your vicinity


Stephen Tarzia
1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2010 Stephen P. Tarzia


  • Family Sharing

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