# Quantum vs Physics Constants Library

The clearest difference is ads: Quantum at none against Physics Constants Library's shown. Quantum also leads on update cadence (every 5 weeks vs every 7 months). Physics Constants Library's advantage is iOS requirement (18.4 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Quantum sells 3 one-off in-app purchases and Physics Constants Library sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Quantum ships an update every 5 weeks, Physics Constants Library every 7 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Quantum | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (150 ratings)](https://appshunter.io/ios/app/quantum-particle-life/id6504465371/reviews)** | — |
| Number of ratings | **150** | — |
| Positive reviews | 81.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 10 MB |
| Requires iOS | 26.0 | **18.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GEORGY OSTROBROD](https://appshunter.io/developer/1875865758) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Quantum

[App page](https://appshunter.io/ios/app/quantum-particle-life/id6504465371)

Explore the hidden world of particles with a real-time simulator. Model up to 10,000 particles and experiment with natural phenomena like crystallization and orbital mechanics. Customize interactions and visualize results dynamically.

**Highlights:** Real-time particle simulation, Model up to 10,000 particles, Simulate natural phenomena, Four distinct particle classes, Customizable rules editor, Dynamic visualizations, Interactive control

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Developer tip | $1.99 | one-time |
| Developer tip | $3.99 | one-time |
| Developer tip | $5.99 | one-time |


### 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 free?

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

### Is Physics Constants Library free?

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

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

Physics Constants Library shows ads; Quantum does not.

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

Quantum ships an update every 5 weeks, and Physics Constants Library every 7 months. Most recently, Quantum was updated on October 24, 2026 and Physics Constants Library on October 22, 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.*