# Quantum Computing vs Physics Constants Library

The clearest difference is ads: Quantum Computing at none against Physics Constants Library's shown. Quantum Computing also leads on update cadence (daily vs every 7 months) and device support (4 vs 1). On price, in-app purchases and iOS requirement there is nothing between them.

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

Quantum Computing ships an update daily, Physics Constants Library every 7 months. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Quantum Computing | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 7 months |
| Size | 2 MB | 10 MB |
| Requires iOS | **17.0** | 18.4 |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Everyware Apps](https://appshunter.io/developer/718530491) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Quantum Computing

[App page](https://appshunter.io/ios/app/quantum-computing/id6523414226)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium features | $3.99 | 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 Computing free?

Quantum Computing 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 Computing or Physics Constants Library have ads?

Physics Constants Library shows ads; Quantum Computing does not.

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

Quantum Computing ships an update daily, and Physics Constants Library every 7 months. Most recently, Quantum Computing was updated on September 12, 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.*