# RST 599 Pro vs SlipStick

The clearest difference is rating: SlipStick at 4.6 against RST 599 Pro's 4.0. SlipStick also leads on review sentiment (83% vs 50%) and update cadence (weekly vs every 2 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

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

SlipStick holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 3 and 9 respectively. Written reviews point the same way: 50% of RST 599 Pro's written reviews are positive against 83% of SlipStick's.

RST 599 Pro ships an update every 2 months, SlipStick weekly. Both last shipped on November 3, 2026.

## The numbers

| Metric | RST 599 Pro | SlipStick |
| --- | --- | --- |
| Price | $4.99 | **$0.99** |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/rst-599-pro/id1497452984/reviews) | **[4.6 (9 ratings)](https://appshunter.io/ios/app/slipstick/id1523544516/reviews)** |
| Number of ratings | 3 | **9** |
| Positive reviews | 50.0% of reviews | **83.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 40 MB | 1 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [Steve Glenner](https://appshunter.io/developer/1518671062) |

## 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


### SlipStick

[App page](https://appshunter.io/ios/app/slipstick/id1523544516)

This app is a fully functional digital reproduction of a classic engineering slide rule. It allows users to perform complex calculations like multiplication, division, logarithms, and trigonometry, just like the original manual tool.

**Highlights:** Virtual slide rule reproduction, Multiplication and division, Logarithm calculations, Trigonometry calculations, Classic engineering tool

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

**In-app purchases:** none


## Frequently asked questions

### Is RST 599 Pro free?

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

### Is SlipStick free?

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

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

SlipStick is rated higher. RST 599 Pro averages 4.0 out of 5 from 3 ratings, while SlipStick averages 4.6 from 9 ratings.

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

Neither RST 599 Pro nor SlipStick shows ads.

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

RST 599 Pro ships an update every 2 months, and SlipStick weekly. Most recently, RST 599 Pro was updated on November 3, 2026 and SlipStick on November 3, 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.*