# Physics Constants Library vs Bone Zone

Physics Constants Library and Bone Zone are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Physics Constants Library sells 1 one-off in-app purchase and Bone Zone sells 1 in-app purchase, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

Physics Constants Library ships an update every 7 months, Bone Zone every 10 months. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Physics Constants Library | Bone Zone |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 7 months** | Every 10 months |
| Size | 10 MB | 8 MB |
| Requires iOS | 18.4 | **18.2** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) | [Brandon Tate](https://appshunter.io/developer/1762298061) |

## 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 |


### Bone Zone

[App page](https://appshunter.io/ios/app/bone-zone/id6752546351)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bone Zone Premium | $9.99 | per year |


## Frequently asked questions

### Is Physics Constants Library free?

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

### Is Bone Zone free?

Bone Zone is free to download, with in-app purchases available.

### Do Physics Constants Library or Bone Zone have ads?

Both Physics Constants Library and Bone Zone show ads.

### Which is updated more often, Physics Constants Library or Bone Zone?

Physics Constants Library ships an update every 7 months, and Bone Zone every 10 months. Most recently, Physics Constants Library was updated on November 12, 2026 and Bone Zone on November 8, 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.*