# Quantum Mechanics vs Mass.Shift

The clearest difference is in-app purchases: Quantum Mechanics at none against Mass.Shift's 2. Quantum Mechanics also leads on iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. Mass.Shift sells 2 in-app purchases, starting at $0.99 per month. Quantum Mechanics asks for nothing beyond the download.

## The numbers

| Metric | Quantum Mechanics | Mass.Shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (179 ratings)](https://appshunter.io/ios/app/quantum-mechanics-theories/id1159692911/reviews)** | — |
| Number of ratings | **179** | — |
| Positive reviews | 43.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Free | — |
| Size | 50 MB | 70 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vitalii Gryniuk](https://appshunter.io/developer/1007630419) | [ADAVII (PVT) LTD](https://appshunter.io/developer/1711708818) |

## What reviewers say

### Quantum Mechanics

[App page](https://appshunter.io/ios/app/quantum-mechanics-theories/id1159692911)

Explore various theories on the model and structure of atoms. This app details concepts like atomic postulates, photon mechanisms, and models for hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, and oxygen. It also covers related physics principles such as gravity, electromagnetism, and time.

**Highlights:** Atomic structure theories, Models of various elements, Photon mechanism explanations, Gravity and electromagnetism concepts, Time and electricity principles, Mathematical algorithms

**Features:** macOS Compatibility

**In-app purchases:** none


### Mass.Shift

[App page](https://appshunter.io/ios/app/massshift/id6757779133)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MassShift Monthly | $0.99 | per month |
| MassShift Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Quantum Mechanics free?

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

### Is Mass.Shift free?

Mass.Shift is free to download, with in-app purchases available.

### Do Quantum Mechanics or Mass.Shift have ads?

Neither Quantum Mechanics nor Mass.Shift 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.*