Rattlegram - SMS via audio!

1.18

aicodix GmbH

4.36

214 reviews

10,000+
Downloads

Free

Transmit short text messages over COFDMTV encoded audio signals

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Rattlegram uses COFDMTV, an OFDM-based audio data technique, to transmit short text messages via encoded audio signals. It supports Modes 14–16 with SPC payloads and employs differential PSK with polar codes for forward error correction. Not ranked in any top lists, it shows steady interest with 10,000+ total downloads and 840 downloads in the last 30 days.

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.

How many times has Rattlegram - SMS via audio! been downloaded?

Rattlegram - SMS via audio! has been downloaded 42 thousand times. In the last 30 days, the app was downloaded 840 times.

What is the rating of Rattlegram - SMS via audio!?

Rattlegram - SMS via audio! is rated 4.36 out of 5 stars, based on 210 ratings.

Is Rattlegram - SMS via audio! free?

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.

What are the requirements for Rattlegram - SMS via audio!?

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:

More data about Rattlegram - SMS via audio!

Price	Free to download
Total downloads	42 thousand
Recent downloads	840
Rating	4.36 based on 210 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 Text App Speed Transmission Button Dtmf Messages Sound Radio Send Input Recent Settings Message Tone Screen Application Letters Frequency Ctcss Time Device Translate Light Learn Supports Generator Network Intercom Translator Translation Adjust Box Devices Tones Internet Microphone Added Clear Real Communication Play Phone Decoder Decode Transmit Vibration

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 28 downloads per day.

Changelog of Rattlegram - SMS via audio!

Show changelog

Developer information for aicodix GmbH

aicodix GmbH

info@aicodix.de

Website

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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.

★★☆☆☆ 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

★★☆☆☆ 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.

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).

Permissions

Hardware controls

record audio

Extra

com.aicodix.rattlegram.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

We haven't collected library information for this app yet. You can use the AppBrain Ad Detector app to detect libraries in apps installed on your device.

Trust & Safety: Requires RECORD_AUDIO permission for audio transmission and includes a dynamic receiver not exported permission. No other highly sensitive permissions are listed; users should review microphone usage and the behavior of dynamically registered receivers.

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