# CONSTRUCTION MASTERY INSTITUTE vs Physics Constants Library

The clearest difference is in-app purchases: CONSTRUCTION MASTERY INSTITUTE at none against Physics Constants Library's 1. CONSTRUCTION MASTERY INSTITUTE also leads on ads (none vs shown) and device support (3 vs 1). On price and update cadence there is nothing between them.

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

CONSTRUCTION MASTERY INSTITUTE ships an update every 4 months, Physics Constants Library every 7 months. The most recent releases landed on October 14, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | CONSTRUCTION MASTERY INSTITUTE | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 7 months |
| Size | 90 MB | 10 MB |
| Requires iOS | **14** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Purple Giraffe](https://appshunter.io/developer/1467994599) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### CONSTRUCTION MASTERY INSTITUTE

[App page](https://appshunter.io/ios/app/construction-mastery-institute/id6447843013)

**Features:** macOS Compatibility

**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 CONSTRUCTION MASTERY INSTITUTE free?

CONSTRUCTION MASTERY INSTITUTE 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 CONSTRUCTION MASTERY INSTITUTE or Physics Constants Library have ads?

Physics Constants Library shows ads; CONSTRUCTION MASTERY INSTITUTE does not.

### Which is updated more often, CONSTRUCTION MASTERY INSTITUTE or Physics Constants Library?

CONSTRUCTION MASTERY INSTITUTE ships an update every 4 months, and Physics Constants Library every 7 months. Most recently, CONSTRUCTION MASTERY INSTITUTE was updated on October 14, 2026 and Physics Constants Library on October 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*