# SignalLearning vs RST 599 Pro

The clearest difference is rating: RST 599 Pro at 4.0 against SignalLearning's 2.0. RST 599 Pro also leads on update cadence (every 2 months vs every 19 months) and ratings volume (3 vs 1). SignalLearning's advantage is price ($0.99 vs $4.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

SignalLearning costs $0.99 and RST 599 Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RST 599 Pro holds the better App Store score, 4.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

SignalLearning ships an update every 19 months, RST 599 Pro every 2 months. The most recent releases landed on October 27, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | SignalLearning | RST 599 Pro |
| --- | --- | --- |
| Price | **$0.99** | $4.99 |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/signallearning/id1446742949/reviews) | **[4.0 (3 ratings)](https://appshunter.io/ios/app/rst-599-pro/id1497452984/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 5 MB | 40 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [domesticusdevelop](https://appshunter.io/developer/373834594) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### SignalLearning

[App page](https://appshunter.io/ios/app/signallearning/id1446742949)

Learn the modern semaphore alphabet with this app. It presents 26 letters and 10 numbers, designed to make memorization easy and provide a testing mechanism for your knowledge.

**Highlights:** Modern semaphore alphabet, 26 letters and 10 numbers, Learning aid, Memorization testing, Visual signal presentation

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is SignalLearning free?

SignalLearning costs $0.99, with no in-app purchases.

### Is RST 599 Pro free?

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

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

RST 599 Pro is rated higher. SignalLearning averages 2.0 out of 5 from 1 ratings, while RST 599 Pro averages 4.0 from 3 ratings.

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

Neither SignalLearning nor RST 599 Pro shows ads.

### Which is updated more often, SignalLearning or RST 599 Pro?

SignalLearning ships an update every 19 months, and RST 599 Pro every 2 months. Most recently, SignalLearning was updated on October 27, 2026 and RST 599 Pro on October 21, 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.*