Rattlegram vs HamSphere 5.0
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.
HamSphere 5.0
This virtual ham radio transceiver simulates HF bands from 10-160m, including 6m, 2m, and 70cm. It features USB, LSB, and CW modes, power settings, and built-in audio filters. Additional instruments can be unlocked via in-app purchases.
- Virtual HF bands (10-160m)
- 6m, 2m, and 70cm bands
- USB, LSB, and CW modes
- Built-in audio filters
- Power setting
- In-app purchase instrument expansions
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This handheld Amateur Radio transceiver offers 10-160m virtual HamSphere HF bands including 6m, 2m and 70cm. It comes with a fully working 30 day trial. The transceiver has three built in audio filters, USB, LSB and CW Modes, power setting. The transceiver can be expanded with a number of useful instruments as in-app-purchases.
Screenshots
Verdict
The clearest difference is review sentiment: Rattlegram at 90% against HamSphere 5.0's 38%. Rattlegram also leads on rating (4.5 vs 3.9) and in-app purchases (none vs 30). HamSphere 5.0's advantage is update cadence (monthly vs every 9 months) and iOS requirement (15.6 vs 17.6). On price, ads 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. HamSphere 5.0 sells 30 one-off in-app purchases. Rattlegram asks for nothing beyond the download.
Rattlegram holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 23 and 7 respectively. Written reviews point the same way: 90% of Rattlegram's written reviews are positive against 38% of HamSphere 5.0's.
Rattlegram ships an update every 9 months, HamSphere 5.0 monthly. The most recent releases landed on September 8, 2026 and August 15, 2026 respectively.
| Parameter | Rattlegram | HamSphere 5.0 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (23 ratings) — better | 3.9 (7 ratings) |
| Positive reviews | 90.0% of reviews — better | 37.5% of reviews |
| Number of ratings | 23 — better | 7 |
| Update frequency | Every 9 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 17+ |
| Developer | aicodix GmbH | HamSphere AB |
Customer experience
Rattlegram
HamSphere 5.0
In-app purchases
Rattlegram
No in-app purchases
HamSphere 5.0
- 3el T-yagi E (30m)$4.99
- 3el T-yagi E (40m)$4.99
- 3el T-yagi W (20m)$4.99
Show 27 moreShow fewer
- 3el T-yagi E (20m)$4.99
- G5RV North-South (10-160m)$4.99
- J-Pole (12m)$6.99
- J-Pole (17m)$6.99
- Plugizer MBP009$6.99
- Lookup Box MBP011$6.99
- J-Pole (11m)$6.99
- J-Pole (20m)$6.99
- Log Book MBP003$6.99
- DX-Monitor MBP008$6.99
- Waterfall MBP002$6.99
- Antenna Selector MBP004$6.99
- Antenna Rotator MBP005$6.99
- Oscilloscope MBP006$6.99
- DX-Cluster MBP010$6.99
- 8-Band Omni Whip (10-40m)$6.99
- J-Pole (10m)$6.99
- G5RV East-West (10-160m)$6.99
- Moxon (20m)$14.99
- Moxon (12m)$14.99
- Moxon (17m)$14.99
- Moxon (10m)$14.99
- Moxon (11m)$14.99
- Bruce Array (60m)$24.99
- Bruce Array (80m)$24.99
- VU2NSB Dangler (20,17, 12,10m)$29.99
- HamSphere Subscription$29.99
