# RST 599x — CW QSO Simulator with pileup

> Amateur radio CW QSO simulator with realistic pile-up and signal conditions. (iPhone/iPad app by koji kamogawa.)

- Source: https://appshunter.io/ios/app/rst-599x/id1498597799 (this page in markdown: same URL + `.md`)
- Developer: [koji kamogawa](https://appshunter.io/developer/1488210713)
- Category: Education, Utilities
- Price: $1.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 71 MB
- Languages: American English
- Released: 2020-02-13
- Data updated: 2026-08-17
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rst-599x/id1498597799/reviews.md

## What is RST 599x?

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.

【Characteristic】
1. Reproduction of pile-up
(Called from up to 3 stations at the same time)
2. "599BK","Rubber Stamp" and "AADX Contest" style support.
3.RIT and CW filter functions 
   Band Width(300Hz/600Hz) control supported.
4.Realistic signal meter according to audio signal level.
5.Status display showing TX / RX operation.
6.The spectrum scope display

【Other features】
1. Function to select the number of QSOs to communicate (5, 20)
2. QRN ON / OFF selection function
3. Function to select the call area (JA's, W / W)
4. Judgement of "RST, QRA and QTH" or "RST, QRA and WX" information.
5.Supported the ESC button for escaping from the long TX/RX.
6.Supported the Score Clear button of your Hi-Score Data.
7.Support the capture function of Hi-Score dialog.
8.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

## Key features

- CW QSO simulation
- Pile-up reproduction
- Multiple QSO styles
- RIT and CW filter
- Realistic signal meter
- Spectrum scope display


## Frequently asked questions about RST 599x

### What types of CW QSO are supported by RST 599x?

RST 599x supports "599BK type QSO", "Rubber stamp type QSO", and "Contest type QSO" (specifically "AADX Contest" style). This allows users to practice different communication styles common in amateur radio.

### Does RST 599x simulate realistic radio conditions?

Yes, the app aims for realism by varying call signs, signal levels, and CW speeds for each QSO. It also includes features like QRN (noise) ON/OFF selection and QSB (fading) in certain modes.

### Can I customize my own station's settings in RST 599x?

Absolutely. You can arbitrarily set the call sign and CW speed of your own station when issuing a CQ. This provides a personalized training environment.

### What are the key simulation features in RST 599x?

Key simulation features include the reproduction of pile-ups (being called by up to 3 stations simultaneously), RIT and CW filter functions with adjustable bandwidth, and a realistic signal meter.

### How does RST 599x handle progress tracking or scoring?

RST 599x allows you to select the number of QSOs to communicate (5 or 20). It also supports a Score Clear button for your Hi-Score Data and a capture function for the Hi-Score dialog.

### Is RST 599x available on all Apple devices?

RST 599x is supported on iPhone and iPod. It also supports keyboard input from Apple Silicon Macs, but it is not compatible with iOS devices in general.

### What is the price of RST 599x?

RST 599x is a paid application, priced at $1.99. This one-time purchase grants you access to all its simulation features.

### How often is RST 599x updated?

The latest version, 4.4.0, was last updated on March 21, 2026. While this indicates a recent update, the frequency of future updates is not specified.

## Version history (last 5 of 5)

### 4.4.0 — 2026-03-21

Improved stability.

### 4.2.0 — 2026-01-31

Fixed for iPhone Max model.

### 4.1.0 — 2025-12-22

Improved stability and screen-resolution compatibility.

### 4.0.0 — 2024-09-01

Supported the German Keyboard Layout.

### 3.8.0 — 2024-01-19

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

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## More apps by koji kamogawa

- [UkeDrum](https://appshunter.io/ios/app/ukedrum/id1488210714)
- [RST 599](https://appshunter.io/ios/app/rst-599/id1488919851)
- [WabunMorse](https://appshunter.io/ios/app/wabunmorse/id1490745806)
- [音耳せん](https://appshunter.io/ios/app/id1496478545)
- [RST 599 Pro](https://appshunter.io/ios/app/rst-599-pro/id1497452984)

All apps by koji kamogawa: https://appshunter.io/developer/1488210713

## Related topics

[rst 599x](https://appshunter.io/ios/topics/rst-599x) · [rst 599](https://appshunter.io/ios/topics/rst-599) · [rst 599 pro](https://appshunter.io/ios/topics/rst-599-pro)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-17.*