Rattlegram vs Stellarect
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.
Stellarect
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Embark on an Astronomical Journey with Stellarect! Stellarect is your ultimate space companion, ready to take you on a journey through the captivating world of astronomy. Our comprehensive news coverage reveals cosmic mysteries, groundbreaking discoveries, and celestial marvels, ensuring you stay informed about the latest in space exploration, planetary science, astrophotography, tutorials, and more. Join Astronomy Hub! Connect with fellow astronomy enthusiasts in dedicated forums, share your passion, and dive deep into discussions about the universe. Whether you're a seasoned astronomer or an enthusiastic stargazer, Stellarect offers curated summaries of top astronomy news from reputable sources, keeping you in the cosmic loop. Explore cosmic phenomena, planetary wonders, and stellar events in our vast universe. Discover the beauty of the night sky through our engaging and informative content, featuring articles and images that unravel the secrets of the cosmos. Download Stellarect today and start your journey through the stars! Unlock an ad-free experience and access to the Astronomy Hub by subscribing to Stellarect Pro today! Privacy Policy https://www.stellarect.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Rattlegram at none against Stellarect's 4. Stellarect's advantage is update cadence (weekly vs every 9 months). On price, ads, device support and iOS requirement 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. Stellarect sells 4 in-app purchases, starting at $0.99 per month. Rattlegram asks for nothing beyond the download.
Rattlegram ships an update every 9 months, Stellarect weekly. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.
| Parameter | Rattlegram | Stellarect |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (28 ratings) — better | — |
| Positive reviews | 90.0% of reviews | — |
| Number of ratings | 28 — better | — |
| Update frequency | Every 9 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | aicodix GmbH | Rohan Gupta |
In-app purchases
Rattlegram
No in-app purchases
Stellarect
- Monthly$0.991 Month
- Stellarect Pro Monthly$1.991 Month
- Yearly$4.991 Year
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- Stellarect Pro Yearly$19.991 Year
