SignalLearning vs RST 599 Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SignalLearning
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.
- Modern semaphore alphabet
- 26 letters and 10 numbers
- Learning aid
- Memorization testing
- Visual signal presentation
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The flag signals presented here are after the modern semaphore alphabet seen from front. Contains 26 letters and 10 numbers. The app is intended to make learning of semaphore alphabet easy and also a test to check your memorization of the signals.
RST 599 Pro
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.
- 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
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This app is a real CW QSO simulator for Amateur Radio. "599BK type QSO", "Rubber stamp type QSO" and "Contest type QSO" are supported. In addition, the call sign, signal level, CW speed, etc. that occur differ for each QSO in order to achieve realism. Furthermore, the call sign and CW speed of your own station that issues CQ can be set arbitrarily. 【Main features】 1. Reproduction of "pile-up" Called from up to 5 stations simultaneously. 2. "599BK","Rubber Stamp" and "AADX Contest" style support. 3.RIT and CW filter functions Band Width(100-999Hz) control supported. 4.Landscape display support. 5.Realistic signal meter according to audio signal level. 6.Status display showing TX / RX operation. 7.The spectrum scope display 【Other features】 1. Select the number of QSOs to communicate. You can choose from 5,10,20,50,100. 2. Ability to select QRN. You can choose None, Weak, Norm, Hard. 3. Function to select Callsign Area. You can choose from JA's USA's or W / W. 4. Function to select SideTone. 5. Synchronized with CW BandPassFilter. 6. Judgement of "RST, QRA and QTH" or "RST, QRA and WX" information. 7.Supported the ESC button from the long TX/RX. 8.Supported the Score Clear button of Hi-Score. 9.Support the capture function of Hi-Score dialog. 10.Supported the QSB in the mode of "599BK / AADX" and "W/W" Supported keyboard input from Apple Silicon Mac. (Not compatible with iOS) [Support Key] A-Z, 0-9, / Enter:return ESC:esc BS:delete CQ:UpArrow AGN:DownArrow TU:[ LEFT:LeftArrow RIGHT:RightArrow
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SignalLearning | RST 599 Pro |
|---|---|---|
| Price | $0.99 — better | $4.99 |
| Rating | 2.0 (1 ratings) | 4.0 (3 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 19 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | domesticusdevelop | koji kamogawa |
Customer experience
SignalLearning
RST 599 Pro
In-app purchases
SignalLearning
No in-app purchases
RST 599 Pro
No in-app purchases
Questions
Is SignalLearning free?
Is RST 599 Pro free?
Which has better reviews, SignalLearning or RST 599 Pro?
Do SignalLearning or RST 599 Pro have ads?
Which is updated more often, SignalLearning or RST 599 Pro?
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