Rattlegram - SMS via audio! app icon

Rattlegram - SMS via audio!

Transmit short text messages over COFDMTV encoded audio signals

aicodix GmbH · com.aicodix.rattlegram

Not rated yet 10K+ downloads v1.13 5.3 MB Android 5.0+ PEGI 3 · Everyone

Download APK 5.3 MB All versions
  • The source store flagged this file with a security warning Details

At a glance

Latest version
v1.13 (14)
Updated
Mar 19, 2024 (2 years ago)
APK size
5.3 MB
Requires
Android 5.0+ (API 21)
CPU support
x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category
Communication (app)
Permissions
2 (1 sensitive)
Website
aicodix.de/cofdmtv
Developer contact
[email protected]
Privacy
Developer's privacy policy

About this APK

Rattlegram - SMS via audio! is an app by aicodix GmbH in the Communication category. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

It asks for 2 permissions, 1 of them sensitive: record audio.

What's new in v1.13

- added configurable repeater delay - added configurable repeater debouncing - internal improvements - updated libs and tools

Description

From the listing uploaded by “dylan1238hewitt”.

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.

Security & authenticity

Security rating: Warning

Signing certificate

  • Certificate issued to “aicodix GmbH” The developer's name — though anyone can put any name in a certificate.

Store checks and file details

  • Developer signature check failed Aug 6, 2026
  • Signed byCN=Ahmet Inan, OU=CEO, O=aicodix GmbH, L=Gilching, ST=Bavaria, C=DE
  • Signing certificate (SHA-1)63:4C:12:4B:68:E9:9C:43:E6:CA:44:1B:69:D9:FD:23:57:AE:62:9B
  • File MD5a4ecca24e3a104ad703b13472bcc78cf
  • Uploaded by “dylan1238hewitt” 2 followers · uploading since 2024

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (2)

Rattlegram - SMS via audio! requests 2 permissions, 1 of them sensitive.

Required hardware & features

Rattlegram - SMS via audio! APK: questions and answers

Can I install this APK over the version I already have?

Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.

Is the Rattlegram - SMS via audio! APK safe?

No one can promise that a file is safe, but some things can be checked. The source store flagged this file with a security warning. After downloading, check that the file's MD5 is a4ecca24e3a104ad703b13472bcc78cf.

Tags

aicodix rattlegram communication

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