Rattlegram - SMS via audio!

Name: Rattlegram - SMS via audio!
Rating: 4.362069 (225 reviews)
Author: aicodix GmbH

By: aicodix GmbH

Transmit short text messages over COFDMTV encoded audio signals

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Features & Capabilities

Rattlegram is a cutting-edge Chrome extension that enables users to transmit short text messages through COFDMTV encoded audio signals. Utilizing COFDM technology, it features 160 ms long OFDM symbols, finely tuned sub-carriers at 6.25 Hz, and robust differential PSK modulation. Forward error correction is ensured with systematic polar codes, enhancing transmission reliability.

Supporting modes 14, 15, and 16, Rattlegram utilizes SPC(2048,x) codes with CRC32C aided SCL decoding and differential QPSK modulation, all within a compact 1600 Hz bandwidth. This allows efficient transmission of 85, 128, or 170 bytes in about one second, making audio-SMS communication quick and dependable. Perfect for audio-based messaging enthusiasts and users looking for innovative communication solutions.

User Growth & Download Statistics

App Communication Developer Tools

By:

Downloads:

Rating:

Version:

1.18 Last updated: 2025-12-17

Version code:

Creation date:

2023-01-12

Publisher country:

Permissions:

android.permission.RECORD_AUDIO Very high risk
com.aicodix.rattlegram.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Size:

11.23MB

Email:

in*****@aicodix.de

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-07-14

Compare stats and ranking:

Ranking

# 314,182 ▼ 1,123

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

aicodix GmbH

Google Play Store

https://play.google.com/store/apps/details?id=com.aicodix.rattlegram

Email:

in*****@aicodix.de

Website:

https://www.aicodix.de/cofdmtv/

User Reviews

Rattlegram is praised for its innovative SMS via audio method, functioning well on simplex radio communication without internet. Users find it practical for emergency or grid-down scenarios and appreciate its straightforward execution. However, the app faces multiple usability issues: messages sometimes fail to decode on various devices, it lacks background listening and screen-lock operation, and it does not support message management features like deletion. Additionally, users request enhancements like encryption, API integration, support for images and GPS, and better compatibility and hardware independence.

Pros

Innovative concept allowing SMS via audio using analog transceivers without internet.
Works well on simplex and certain radios with good quality and connection.
Offers a unique solution for communication in grid-down or no-internet scenarios.
User-friendly and well executed as per several reviews.
Includes useful features like parrot feedback indicating message reception.

Cons

Lacks background operation and does not work with the screen locked, limiting usability.
Message decoding failures on some devices, leading to unsuccessful message translation.
No option to delete or clear messages, causing clutter and usability issues.
Limited functionality, such as absence of encryption, API integration, and ability to send images or GPS data.
Compatibility issues such as "Mode 16 not supported" errors on certain phones and dependency on hardware like APRS cables.