Rattlegram - SMS via audio!

1.18

aicodix GmbH

4.38

217 reviews

10,000+
Downloads

Free

Transmit short text messages over COFDMTV encoded audio signals

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Rattlegram - SMS via audio! Screenshot 5 of 5

4.38 · 217 reviews · 10,000+ downloads

Pros & Cons

Niche, audio-based messaging differentiates it from traditional texting apps
Efficient low-bandwidth design with compact payloads
Robust error correction via polar codes and differential PSK
Active development with 16 KB page size support and libs/tools updates

Not listed in any top app lists, which may affect visibility
Niche encoding focus may limit appeal to mainstream users
Lacks conventional text/radio-style features emphasized by some competitors (based on available keywords)

About Rattlegram - SMS via audio!

Rattlegram - SMS via audio! is a communication app developed by aicodix GmbH.

Download Statistics

Rattlegram - SMS via audio! has been downloaded 42 thousand times. In the last 30 days, the app was downloaded 780 times.

User Ratings

Rattlegram - SMS via audio! is rated 4.38 out of 5 stars. The rating is based on 220 ratings.

App Information

Rattlegram - SMS via audio! is FREE to download. The APK download size is 5.31 MB. The latest version available is 1.18. The last update was on November 11, 2025.

Technical Requirements

The app has a content rating of Everyone. The app has been available on Google Play January 2023.

Description

COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology:
- 160 ms long OFDM symbols
- 6.25 Hz per sub-carrier
- 1/8 guard interval
- differentially encoded PSK (phase-shift keying) modulation
- systematic polar codes for forward error correction

Currently Modes 14, 15 and 16 are supported:
Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload.
Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.

Recent changes:
- added support for 16 KB page size
- updated libs and tools

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More data about Rattlegram - SMS via audio!

Price	Free to download
Total downloads	42 thousand
Recent downloads	780
Rating	4.38 based on 220 ratings
Ranking	Not ranked
Version	1.18
APK size	5.31 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the Rattlegram - SMS via audio! app

Rattlegram - SMS via audio! compared with similar apps

Common keywords of similar apps

Spc Cofdmtv Encoded Hz Modulation Audio

Keywords missing from this app

Morse Code App Text Radio Transmission Speed Button Sound Messages Send Support Device Input Recent Settings Dtmf Message Version Tv Ctcss Time Devices Frequency Application Translate Network Light Screen Features Supports Tone Intercom Microphone Translator Decode Transmit Translation Adjust Box Signals Internet Free File Letters Clear Sdr Learn Phone

Google Play Rating history and histogram

150

Downloads over time

Rattlegram - SMS via audio! has been downloaded 42 thousand times. Over the past 30 days, it averaged 26 downloads per day.

Changelog of Rattlegram - SMS via audio!

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Developer information for aicodix GmbH

aicodix GmbH

info@aicodix.de

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Comments on Rattlegram - SMS via audio! for Android

★★★★★ TacticalBacon · Apr 23, 2023

Can we get the ping feature to trigger a notification on phone and a toggle option for it to listen in background or messages triggering a notification, so you can ping someone before sending a message, and they will be ready to receive and be alerted to it or a radio pass-through This will allow us to be able to receive messages while also using our phones for other task while using handle held Aux cable where you would no longer hear radio noise

★★★★☆ Doug Offord · Feb 2, 2025

Works well. Would like to have ability to send longer text messages and images.

★★☆☆☆ Adrian Anderson · Jan 24, 2024

The app isn't translating the received messages. I uninstalled and reinstalled the app multiple times trying to fix it but no dice.

★☆☆☆☆ Knowledgeablelandon · May 27, 2024

Garbage! Every message fails to decode, therefore this app is useless. Should be deleted from the play store.

★★☆☆☆ William Linton · Jan 22, 2024

Need better directions on how to use it. It took me forever to get it to work. Sometimes it doesn't work at all

Google Play Rankings for Rattlegram - SMS via audio!

This app is not ranked

Technologies used by Rattlegram - SMS via audio!

Rattlegram - SMS via audio! is requesting 2 permissions and we don't have library information (yet).
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