# Physics Constants Library vs COMath Premium

The clearest difference is price: Physics Constants Library at Free against COMath Premium's $0.99. COMath Premium's advantage is in-app purchases (none vs 1) and ads (none vs shown).

Physics Constants Library is free to download; COMath Premium costs $0.99 up front. Physics Constants Library sells 1 one-off in-app purchase. COMath Premium asks for nothing beyond the download.

Physics Constants Library ships an update every 7 months, COMath Premium every 2 weeks. The most recent releases landed on October 22, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Physics Constants Library | COMath Premium |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Size | 10 MB | 85 MB |
| Requires iOS | 18.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) | [Jianfeng Wu](https://appshunter.io/developer/1435210283) |

## What reviewers say

### 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 |


### COMath Premium

[App page](https://appshunter.io/ios/app/comath-premium/id6752225245)

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

**In-app purchases:** none


## Frequently asked questions

### Is Physics Constants Library free?

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

### Is COMath Premium free?

COMath Premium costs $0.99, with no in-app purchases.

### Do Physics Constants Library or COMath Premium have ads?

Physics Constants Library shows ads; COMath Premium does not.

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

Physics Constants Library ships an update every 7 months, and COMath Premium every 2 weeks. Most recently, Physics Constants Library was updated on October 22, 2026 and COMath Premium on October 28, 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.*