iPhone Screenshots


With APT you can transmit and receive images acoustically. To do this each column of the selected gets transformed by a Fast Fourier Transform and outputed through iPhones speaker. On the receiving iOS-device the received audio is visualized by a spectrogram and the incoming images get visible. You can use this app for example to transmit images very easily over a phone or to put images in every kind of audio recording.

The pro-version has the additional features of choosing between two coding methods, choosing between linear and logarithmic frequency scale and the ability of sending the resulting audio as email. Also, the pro-version isn't ad-supported.

What's New

Version 1.1

support of iPhone 6 and iOS 8

Ratings and Reviews

4.4 out of 5

10 Ratings

10 Ratings

This app is of high quality and has amazing uses!


I fell in love with it when I first downloaded the free version. The free version is very useful, but this is one of those rare apps that I liked so much I bought the pro version. It adds emailing the sound file to any computer among other things. A major update added features and works great with iPhone 6+ / iOS 8.2. I love how true the images are to their originals, even in less-than-perfect conditions at lower sample rates, like those used in a telephone. The linear/logarithmic switch actually changes how the picture is transmitted and helps emphasize the high (harder to receive) frequencies and hence detail. The possibilities are limitless to be able to send pictures by sound--put it in music--disguise (conceal) it with the "noise" feature (great for a short message or symbol). The moving spectrogram is pretty awesome, as birds, whistles, cats and everyday sounds reveal distinct images (which you can save). This app is sophisticated and unique. Kudos to the programmer! A+

Very unique!


A very cool and unique app. I've never seen anything else like it. If you're looking for something to do absolutely crazy things with photos and images, this is your app. (On the other hand if you're looking for a regular app to transfer photos between phones this is not it!) You can interject and all sorts of your own sounds while the image is being transmitted to deform it quite nicely. Shout, sing, play the radio, go to a crowded public place and try it. The resulting images are one of a kind.

You can try the free version first to see if you like it.

Warning: this app is totally useless to anyone looking to do high quality "normal" photography. If that's you, stay away. With an app this brilliant and distinctive, the last thing they need is one star reviews because somebody thought it was something it wasn't.

Just what I was looking for.

Farkle Unaddicted

I've imagined doing exactly what this app does since way back before cell phones existed. I imagined people sending secret messages by visualizing, through using little handheld fft devices. When texting came out I figured it obsolete. But here it has come to life! This is a dream come to life, man! Props.


Dominik Seibold
1.3 MB
Photo & Video
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2011 Dominik Seibold


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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