# SlipStick vs Professor Quantum

The clearest difference is price: Professor Quantum at Free against SlipStick's $0.99. SlipStick's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Professor Quantum is free to download; SlipStick costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | SlipStick | Professor Quantum |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/slipstick/id1523544516/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Paid | — |
| Size | 1 MB | 172 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Steve Glenner](https://appshunter.io/developer/1518671062) | [ICB LABS FZCO](https://appshunter.io/developer/6775509077) |

## What reviewers say

### 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


### Professor Quantum

[App page](https://appshunter.io/ios/app/professor-quantum/id6793537346)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SlipStick free?

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

### Is Professor Quantum free?

Professor Quantum is free to download, with no in-app purchases.

### Do SlipStick or Professor Quantum have ads?

Neither SlipStick nor Professor Quantum shows ads.

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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.*