# Physics Formula Library by CS vs Physics Formula Master 9

The clearest difference is in-app purchases: Physics Formula Master 9 at none against Physics Formula Library by CS's 1. Physics Formula Master 9 also leads on ads (none vs shown) and update cadence (every 6 days vs every 6 months). On price there is nothing between them.

Both are free to download. Physics Formula Library by CS sells 1 one-off in-app purchase. Physics Formula Master 9 asks for nothing beyond the download.

Physics Formula Library by CS ships an update every 6 months, Physics Formula Master 9 every 6 days. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Physics Formula Library by CS | Physics Formula Master 9 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 6 days** |
| Size | 10 MB | 21 MB |
| Requires iOS | 18.4 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) | [Thu Linh Bui](https://appshunter.io/developer/1855389060) |

## What reviewers say

### Physics Formula Library by CS

[App page](https://appshunter.io/ios/app/physics-formula-library-by-cs/id6752376666)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $1.99 | one-time |


### Physics Formula Master 9

[App page](https://appshunter.io/ios/app/physics-formula-master-9/id6755665321)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Physics Formula Library by CS free?

Physics Formula Library by CS is free to download, with in-app purchases available.

### Is Physics Formula Master 9 free?

Physics Formula Master 9 is free to download, with no in-app purchases.

### Do Physics Formula Library by CS or Physics Formula Master 9 have ads?

Physics Formula Library by CS shows ads; Physics Formula Master 9 does not.

### Which is updated more often, Physics Formula Library by CS or Physics Formula Master 9?

Physics Formula Library by CS ships an update every 6 months, and Physics Formula Master 9 every 6 days. Most recently, Physics Formula Library by CS was updated on September 10, 2026 and Physics Formula Master 9 on September 11, 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.*