Rattlegram vs Grupi App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rattlegram
This app utilizes advanced COFDM technology for audio-based SMS transmission. It supports various modes with specific encoding and modulation techniques, requiring minimal bandwidth for efficient data transfer.
- COFDM technology
- Audio-based SMS
- 160 ms OFDM symbols
- Differential PSK modulation
- Forward error correction
- Low bandwidth requirement
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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.
Grupi App
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Grupi te ayuda a conectarte con personas de ideas afines que comparten tus pasiones y objetivos. Ya sea que estés buscando un mentor, un socio, un amigo o un colaborador, Grupi te ayudará a encontrar tu partner perfecto o tu comunidad ideal. Puedes elegir cómo y cuándo quieres interactuar con los demás y explorar nuevas oportunidades de crecimiento personal y profesional. Grupi te permite saber quiénes son y dónde están, para que puedas construir relaciones auténticas y significativas.
Screenshots
Verdict
The clearest difference is update cadence: Grupi App at weekly against Rattlegram's every 9 months. Grupi App also leads on iOS requirement (12.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Rattlegram ships an update every 9 months, Grupi App weekly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | Rattlegram | Grupi App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (29 ratings) — better | — |
| Positive reviews | 90.0% of reviews | — |
| Number of ratings | 29 — better | — |
| Update frequency | Every 9 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | aicodix GmbH | Jose Ignacio Uribe |
In-app purchases
Rattlegram
No in-app purchases
Grupi App
No in-app purchases
