# Mandel vs RST 599 Pro

The clearest difference is review sentiment: Mandel at 100% against RST 599 Pro's 50%. Mandel also leads on price (Free vs $4.99). RST 599 Pro's advantage is rating (4.0 vs 3.2) and update cadence (every 2 months vs every 62 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Mandel 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.

RST 599 Pro holds the better App Store score, 4.0 against 3.2. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews complicate that: 100% of Mandel's written reviews are positive against 50% of RST 599 Pro's, so the app with the better star average is not the one people write more warmly about.

Mandel ships an update every 62 months, RST 599 Pro every 2 months. The most recent releases landed on October 5, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Mandel | RST 599 Pro |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [3.2 (5 ratings)](https://appshunter.io/ios/app/mandel-gl/id1230459217/reviews) | **[4.0 (3 ratings)](https://appshunter.io/ios/app/rst-599-pro/id1497452984/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 62 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 40 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Technische Universitaet Bergakademie Freiberg](https://appshunter.io/developer/454471759) | [koji kamogawa](https://appshunter.io/developer/1488210713) |

## What reviewers say

### Mandel

[App page](https://appshunter.io/ios/app/mandel-gl/id1230459217)

Explore the intricate beauty of the Mandelbrot set with this educational app. Zoom into fractal patterns, adjust rendering parameters, and choose from vibrant color themes. Learn about the mathematical and historical context behind this fascinating fractal.

**Highlights:** Render Mandelbrot set snapshots, Zoom functionality, Adjust iteration count, Manipulate render scale, Four colorful themes, Mathematical background information, Open-source code

**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 Mandel free?

Mandel is free to download, 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, Mandel or RST 599 Pro?

RST 599 Pro is rated higher. Mandel averages 3.2 out of 5 from 5 ratings, while RST 599 Pro averages 4.0 from 3 ratings.

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

Neither Mandel nor RST 599 Pro shows ads.

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

Mandel ships an update every 62 months, and RST 599 Pro every 2 months. Most recently, Mandel was updated on October 5, 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.*