# Motion physics app vs Physics Constants Library

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

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

Motion physics app ships an update daily, Physics Constants Library every 7 months. The most recent releases landed on September 11, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Motion physics app | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 7 months |
| Size | 25 MB | 10 MB |
| Requires iOS | **11.0** | 18.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [The Real Start](https://appshunter.io/developer/1154232657) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Motion physics app

[App page](https://appshunter.io/ios/app/motion-physics-app/id6451367054)

**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 Motion physics app free?

Motion physics app 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 Motion physics app or Physics Constants Library have ads?

Physics Constants Library shows ads; Motion physics app does not.

### Which is updated more often, Motion physics app or Physics Constants Library?

Motion physics app ships an update daily, and Physics Constants Library every 7 months. Most recently, Motion physics app was updated on September 11, 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.*