# Physical Constants vs Physics Constants Library

The clearest difference is in-app purchases: Physical Constants at none against Physics Constants Library's 1. Physical Constants also leads on device support (3 vs 1) and iOS requirement (12.0 vs 18.4). On price, update cadence and ads there is nothing between them.

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

Physical Constants ships an update every 9 months, Physics Constants Library every 7 months. The most recent releases landed on October 14, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Physical Constants | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/physical-constants-ml/id837679891/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | **Every 7 months** |
| Monetization | Ad-supported | — |
| Size | 25 MB | 10 MB |
| Requires iOS | **12.0** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Physical Constants

[App page](https://appshunter.io/ios/app/physical-constants-ml/id837679891)

Access a comprehensive list of physical constants, organized by category for easy searching. This app supports all AppStore languages and allows users to report corrections via email.

**Highlights:** Physical constants database, Categorized by topic, Search functionality, Multi-language support, User feedback for corrections

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

**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 Physical Constants free?

Physical Constants 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 Physical Constants or Physics Constants Library have ads?

Both Physical Constants and Physics Constants Library show ads.

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

Physical Constants ships an update every 9 months, and Physics Constants Library every 7 months. Most recently, Physical Constants was updated on October 14, 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.*