BlueDV vs Rattlegram
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BlueDV
Transform your Apple device into a DMR and Fusion hotspot. This app enables seamless connectivity with a DVMEGA and iBlueStack for amateur radio communication.
- DMR hotspot functionality
- Fusion hotspot functionality
- Works with DVMEGA
- Works with iBlueStack
- Utilizes Apple device
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With this application you can use your Apple device as a DMR and Fusion hotspot in combination with a DVMEGA and iBlueStack.
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.
Screenshots
Verdict
The clearest difference is rating: Rattlegram at 4.5 against BlueDV's 3.1. Rattlegram also leads on review sentiment (90% vs 52%). BlueDV's advantage is iOS requirement (10.0 vs 17.6). On price, ratings volume, update cadence and ads 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 holds the better App Store score, 4.5 against 3.1. Both are backed by a comparable volume of ratings — 24 and 23 respectively. Written reviews point the same way: 52% of BlueDV's written reviews are positive against 90% of Rattlegram's.
BlueDV ships an update every 4 months, Rattlegram every 9 months. The most recent releases landed on October 8, 2026 and September 25, 2026 respectively.
| Parameter | BlueDV | Rattlegram |
|---|---|---|
| Price | Free | Free |
| Rating | 3.1 (24 ratings) | 4.5 (23 ratings) — better |
| Positive reviews | 52.2% of reviews | 90.0% of reviews — better |
| Number of ratings | 24 — better | 23 |
| Update frequency | Every 4 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 39 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | David Grootendorst | aicodix GmbH |
Customer experience
BlueDV
Rattlegram
In-app purchases
BlueDV
No in-app purchases
Rattlegram
No in-app purchases
