PSK31 vs DRM+ SDR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PSK31
Decode and view ham radio PSK31 transmissions directly on your iPad. Tune into specific signals with a tap and see the decoded text, all without needing a separate computer. Features a waterfall display to visualize the audio spectrum.
- Monitor PSK31 transmissions
- View decoded text
- Waterfall display of audio spectrum
- Tap to tune into signals
- No computer required
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Want to monitor PSK31 transmissions, without using a bulky computer? PSK31 lets you view ham radio PSK31 transmissions on your iPad. Just set your iPad next to your radio, tune in a PSK31 frequency, and watch the decoded text. There's a waterfall display of the audio spectrum, showing all of the PSK31 transmission. Tap on a signal, and PSK31 tunes into that transmission. Get your copy of PSK31 right now, and start decoding and displaying PSK31 transmissions in minutes.
DRM+ SDR
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Decodes DRM (Digital Radio Mondiale) signals coming in through the external microphone input (LINE-IN) or DCP file input. (We need to supply DRM signal to microphone input.) The DRM+ SDR app is for DRM30 decoding with HE-AAC, OPUS and xHE-AAC. The paid DRM+ SDR app decodes sound, metadata, slideshow, web browsers. This app does not support decoding Journaline data in DRM signals. The DRM+ app requires a RC high pass filter audio line as well as a RF front-end module with antenna, tuner, modulator, IF mixer, AF amplifier. If a call is received while the app is running, please remove the audio line connected to the external microphone jack.
Screenshots
Verdict
The clearest difference is update cadence: DRM+ SDR at every 2 months against PSK31's every 18 months. PSK31's advantage is price ($2.99 vs $4.99) and iOS requirement (6.0 vs 12.0). On 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
PSK31 costs $2.99 and DRM+ SDR $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PSK31 ships an update every 18 months, DRM+ SDR every 2 months. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.
| Parameter | PSK31 | DRM+ SDR |
|---|---|---|
| Price | $2.99 — better | $4.99 |
| Rating | 3.6 (15 ratings) — better | — |
| Positive reviews | 52.2% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 18 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 6.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | AlgorKorea Co., Ltd. |
In-app purchases
PSK31
No in-app purchases
DRM+ SDR
No in-app purchases
