# Dirac equation vs Physics Formula Library by CS

The clearest difference is in-app purchases: Dirac equation at none against Physics Formula Library by CS's 1. Dirac equation also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

## The numbers

| Metric | Dirac equation | Physics Formula Library by CS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 6 months |
| Size | 5 MB | 10 MB |
| Requires iOS | **17** | 18.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Dirac equation

[App page](https://appshunter.io/ios/app/dirac-equation/id6739155551)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Dirac equation free?

Dirac equation is free to download, with no in-app purchases.

### Is Physics Formula Library by CS free?

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

### Do Dirac equation or Physics Formula Library by CS have ads?

Physics Formula Library by CS shows ads; Dirac equation does not.

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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.*