# PSK31 vs DRM+ SDR

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.

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.

## The numbers

| Metric | PSK31 | DRM+ SDR |
| --- | --- | --- |
| Price | **$2.99** | $4.99 |
| Rating | **[3.6 (15 ratings)](https://appshunter.io/ios/app/psk31/id385619882/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 52.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 1 MB | 6 MB |
| Requires iOS | **6.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [AlgorKorea Co., Ltd.](https://appshunter.io/developer/1173452285) |

## What reviewers say

### PSK31

[App page](https://appshunter.io/ios/app/psk31/id385619882)

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.

**Highlights:** Monitor PSK31 transmissions, View decoded text, Waterfall display of audio spectrum, Tap to tune into signals, No computer required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### DRM+ SDR

[App page](https://appshunter.io/ios/app/drm-plus-sdr/id1475044823)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PSK31 free?

PSK31 costs $2.99, with no in-app purchases.

### Is DRM+ SDR free?

DRM+ SDR costs $4.99, with no in-app purchases.

### Do PSK31 or DRM+ SDR have ads?

Neither PSK31 nor DRM+ SDR shows ads.

### Which is updated more often, PSK31 or DRM+ SDR?

PSK31 ships an update every 18 months, and DRM+ SDR every 2 months. Most recently, PSK31 was updated on October 2, 2026 and DRM+ SDR on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*