# Koch Trainer vs SDR

The clearest difference is price: Koch Trainer at $0.99 against SDR's $49.99. Koch Trainer also leads on device support (3 vs 1) and iOS requirement (6.0 vs 17.6). SDR's advantage is rating (4.2 vs 3.2) and review sentiment (78% vs 50%). On ads and in-app purchases there is nothing between them.

Koch Trainer costs $0.99 and SDR $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SDR holds the better App Store score, 4.2 against 3.2. Both are backed by a comparable volume of ratings — 18 and 70 respectively. Written reviews point the same way: 50% of Koch Trainer's written reviews are positive against 78% of SDR's.

Koch Trainer ships an update every 2 months, SDR every 2 weeks. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Koch Trainer | SDR |
| --- | --- | --- |
| Price | **$0.99** | $49.99 |
| Rating | [3.2 (18 ratings)](https://appshunter.io/ios/app/koch-trainer/id405137883/reviews) | **[4.2 (70 ratings)](https://appshunter.io/ios/app/sdr-control-for-icom/id1614141094/reviews)** |
| Number of ratings | 18 | **70** |
| Positive reviews | 50.0% of reviews | **78.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Paid |
| Size | 7 MB | 55 MB |
| Requires iOS | **6.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pignology, LLC](https://appshunter.io/developer/308437403) | [Marcus Roskosch](https://appshunter.io/developer/334053438) |

## What reviewers say

### Koch Trainer

[App page](https://appshunter.io/ios/app/koch-trainer/id405137883)

Learn Morse code efficiently using the Koch Method. This app trains your reflexes to receive code at a faster speed, enabling quicker mastery of the language.

**Highlights:** Koch Method training, Learn at receiving speed, Faster reflex training, Morse code practice, 20 WPM training speed

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

**In-app purchases:** none


### SDR

[App page](https://appshunter.io/ios/app/sdr-control-for-icom/id1614141094)

Control compatible Icom transceivers remotely or locally from your iPad. Offers full operation, dual VFO, a logbook, and integrated digital modes like FT8/FT4, SSTV, and CW decoding.

**Highlights:** Remote transceiver operation, Dual VFO and DualWatch, Integrated logbook with ADIF support, FT8/FT4, SSTV, and CW decoder tools, DX-Cluster integration, Call sign lookup and map display

**In-app purchases:** none


## Frequently asked questions

### Is Koch Trainer free?

Koch Trainer costs $0.99, with no in-app purchases.

### Is SDR free?

SDR costs $49.99, with no in-app purchases.

### Which has better reviews, Koch Trainer or SDR?

SDR is rated higher. Koch Trainer averages 3.2 out of 5 from 18 ratings, while SDR averages 4.2 from 70 ratings.

### Do Koch Trainer or SDR have ads?

Neither Koch Trainer nor SDR shows ads.

### Which is updated more often, Koch Trainer or SDR?

Koch Trainer ships an update every 2 months, and SDR every 2 weeks. Most recently, Koch Trainer was updated on October 23, 2026 and SDR on October 27, 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.*