# RST 599 Pro vs LemurKey

The clearest difference is review sentiment: LemurKey at 100% against RST 599 Pro's 50%. LemurKey also leads on price (Free vs $4.99) and rating (5.0 vs 4.0). RST 599 Pro's advantage is iOS requirement (12.0 vs 15.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

LemurKey is free to download; RST 599 Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LemurKey holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 6 respectively. Written reviews point the same way: 50% of RST 599 Pro's written reviews are positive against 100% of LemurKey's.

## The numbers

| Metric | RST 599 Pro | LemurKey |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/rst-599-pro/id1497452984/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/lemurkey/id6798342620/reviews)** |
| Number of ratings | 3 | **6** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Paid | **Free** |
| Size | 40 MB | 8 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [Steve Metcalf](https://appshunter.io/developer/6798342622) |

## What reviewers say

### RST 599 Pro

[App page](https://appshunter.io/ios/app/rst-599-pro/id1497452984)

This application simulates amateur radio CW QSOs with realistic call signs, signal levels, and speeds. It supports various QSO styles, pile-ups, and includes features like RIT, CW filters, and a spectrum scope for an immersive experience.

**Highlights:** Realistic CW QSO simulation, Pile-up reproduction (up to 5 stations), Multiple QSO style support, RIT and CW filter functions, Spectrum scope display, Customizable call sign and CW speed

**Features:** macOS Compatibility

**In-app purchases:** none


### LemurKey

[App page](https://appshunter.io/ios/app/lemurkey/id6798342620)

This app provides Morse code receiving practice for callsigns, sentences, and two-way contacts. It features adjustable settings, a Koch-style learning mode, and simulated interference for realistic training. Compete with friends on leaderboards and track your progress.

**Highlights:** Morse receiving practice, Adjustable WPM and spacing, Scripted two-way QSO mode, Live DX band conditions, Koch-style learning mode, Simulated interference options

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RST 599 Pro free?

RST 599 Pro costs $4.99, with no in-app purchases.

### Is LemurKey free?

LemurKey is free to download, with no in-app purchases.

### Which has better reviews, RST 599 Pro or LemurKey?

LemurKey is rated higher. RST 599 Pro averages 4.0 out of 5 from 3 ratings, while LemurKey averages 5.0 from 6 ratings.

### Do RST 599 Pro or LemurKey have ads?

Neither RST 599 Pro nor LemurKey shows ads.

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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.*