# Quantum Interpretations vs Physics Constants Library

The clearest difference is in-app purchases: Quantum Interpretations at none against Physics Constants Library's 1. Quantum Interpretations also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Physics Constants Library sells 1 one-off in-app purchase. Quantum Interpretations asks for nothing beyond the download.

Quantum Interpretations ships an update every 9 months, Physics Constants Library every 7 months. The most recent releases landed on July 4, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Quantum Interpretations | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/quantum-interpretations/id6747673105/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 7 months** |
| Monetization | Free | — |
| Size | 53 MB | 10 MB |
| Requires iOS | **17.2** | 18.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandr Shuiskov](https://appshunter.io/developer/1807440595) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Quantum Interpretations

[App page](https://appshunter.io/ios/app/quantum-interpretations/id6747673105)

Explore the complex world of quantum mechanics interpretations with this pocket guide. It simplifies each concept with summaries, explanations, pros and cons, and engaging facts. Test your knowledge with quizzes and visualize the ideas.

**Highlights:** Simplified explanations of quantum interpretations, Pros and cons analysis, Key figures and pop culture references, Knowledge quizzes, Visual illustrations, Further reading resources

**Features:** macOS Compatibility

**In-app purchases:** none


### Physics Constants Library

[App page](https://appshunter.io/ios/app/physics-constants-library/id6751224343)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $2.99 | one-time |


## Frequently asked questions

### Is Quantum Interpretations free?

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

### Is Physics Constants Library free?

Physics Constants Library is free to download, with in-app purchases available.

### Do Quantum Interpretations or Physics Constants Library have ads?

Physics Constants Library shows ads; Quantum Interpretations does not.

### Which is updated more often, Quantum Interpretations or Physics Constants Library?

Quantum Interpretations ships an update every 9 months, and Physics Constants Library every 7 months. Most recently, Quantum Interpretations was updated on July 4, 2026 and Physics Constants Library on September 20, 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.*