# PP+ Archimedes Principle vs Material Engineering

The clearest difference is price: Material Engineering at Free against PP+ Archimedes Principle's $1.99. Material Engineering also leads on update cadence (every 3 months vs every 29 months). PP+ Archimedes Principle's advantage is in-app purchases (none vs 6). On ads, device support and iOS requirement there is nothing between them.

Material Engineering is free to download; PP+ Archimedes Principle costs $1.99 up front. Material Engineering sells 6 in-app purchases, starting at $9.99 per month. PP+ Archimedes Principle asks for nothing beyond the download.

PP+ Archimedes Principle ships an update every 29 months, Material Engineering every 3 months. The most recent releases landed on February 1, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | PP+ Archimedes Principle | Material Engineering |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/material-engineering/id6739977362/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 3 months** |
| Monetization | — | Free with in-app purchases |
| Size | 111 MB | 17 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedron Learning Media, Inc.](https://appshunter.io/developer/458882328) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### PP+ Archimedes Principle

[App page](https://appshunter.io/ios/app/pp-archimedes-principle/id622367686)

**Features:** macOS Compatibility

**In-app purchases:** none


### Material Engineering

[App page](https://appshunter.io/ios/app/material-engineering/id6739977362)

Master material science concepts with an engaging quiz app. Explore diverse topics, receive instant feedback, and track your progress. Perfect for students, professionals, and enthusiasts seeking to deepen their understanding of materials.

**Highlights:** Comprehensive quizzes on various material types, Expert-designed challenging questions, Instant feedback with detailed explanations, Personalized progress tracking and analytics, Diverse quiz modes (practice, timed, topic-focused), Achievements and leaderboards

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is PP+ Archimedes Principle free?

PP+ Archimedes Principle costs $1.99, with no in-app purchases.

### Is Material Engineering free?

Material Engineering is free to download, with in-app purchases available.

### Do PP+ Archimedes Principle or Material Engineering have ads?

Neither PP+ Archimedes Principle nor Material Engineering shows ads.

### Which is updated more often, PP+ Archimedes Principle or Material Engineering?

PP+ Archimedes Principle ships an update every 29 months, and Material Engineering every 3 months. Most recently, PP+ Archimedes Principle was updated on February 1, 2026 and Material Engineering on October 16, 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.*