Download Audio MODEM apk 1.0 free for Android smartphone

1 May

Posted by Roman Zeyde in Communication | May 1, 2015 | 9 Comments

Apk file size: 985.0 KB

This application enables the user to transmit data between air-gapped devices using audio.
It uses a simple MODEM algorithm to enable the user to send and receive short data messages (up to 250 bytes, within up to 3 seconds) between nearby phones or computers, utilizing the sender's speaker and the receiver's microphone.

Please use GitHub ( to report any issue you have with the application.

You can also use the following Python implementation ( to communicate with a computer.

Whats new

    Initial version for Audio MODEM Android application.

Roman Zeyde part of our Communication and have average installs from 500 to 1000. Last Update May 1, 2015. Google play rating is 94.1177. Current verison is 1.0. Actual size 985.0 KB.

Download audio-modem.apk 985.0 KB


Prashant Pandey

Not working Tested the application with multiple phones, keep getting bad checksum error.

Jes Vestervang Jensen

Works great and is reliable at up to 40 cm between two phones.

Gordon Truong

Great but the beep at the beginning. 2nd Review after a while of use: While the transmission stream sounded fine, I don't quite get why there is a beep at the preamble of the transmission, couldn't it sound like the rest of the TX stream or could it be omitted? It seems to bother me because a actual radio TX I know if don't usually have a distinct sound at the beginning—in fact, it kind of sounds like my notification beeping sound.

Robert Towns

So much potential! Can't wait to connect this to an fm xmtr or walkie talkie to see if it works. Kinda wish you didn't have to press receive every time but not a big deal. I'm sure I'll be use the python code anyway.


One of a kind App. I like the idea very much. Could this be modified to act as a coupling to the Phone Audio so that a Smartphone could be used to connect with a Fax machine? If so you could add a RIP interface for documents and have the worlds first true Direct Smartphone Fax !!! Much money $$$ :-D

Sergei Alonichau

Love the concept! Thanks for the link to github.

Jean Souza

Amazing! Super fast! Works on my old devices! Thanks!

James Demaine

I have a few ideas here, but.. My only limit is that it only allows text up to 250 bytes. It would be much nicer if I could transfer files, or at least an unlimited amount of text! I would support this any day!

Sani Kumar

Nice app! Ultimate use of tone... roman i wud like to know the algorithm u have written to implement this app..

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