# Chemical Engineering+ vs Rew

The clearest difference is ads: Chemical Engineering+ at none against Rew's shown. Rew's advantage is update cadence (every 3 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Chemical Engineering+ sells 6 in-app purchases, starting at $9.99 per month and Rew sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Chemical Engineering+ ships an update every 2 months, Rew every 3 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Chemical Engineering+ | Rew |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/chemical-engineering-plus/id6740001145/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 16 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Ernst Danielle Legaspi](https://appshunter.io/developer/6794576535) |

## What reviewers say

### Chemical Engineering+

[App page](https://appshunter.io/ios/app/chemical-engineering-plus/id6740001145)

Test your knowledge of chemical engineering with a comprehensive quiz app. It offers thousands of questions across various topics, adaptive difficulty, and detailed explanations to enhance learning. Prepare for exams and boost your industry skills with this interactive tool.

**Highlights:** Extensive question bank, Topic-specific quizzes, Calculations & problem solving, Adaptive difficulty, Interactive learning with explanations, Offline play, Leaderboard competition

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

**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 |


### Rew

[App page](https://appshunter.io/ios/app/rew-ai-study-companion/id6794576533)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7 Topic Credits | $0.99 | one-time |


## Frequently asked questions

### Is Chemical Engineering+ free?

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

### Is Rew free?

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

### Do Chemical Engineering+ or Rew have ads?

Rew shows ads; Chemical Engineering+ does not.

### Which is updated more often, Chemical Engineering+ or Rew?

Chemical Engineering+ ships an update every 2 months, and Rew every 3 days. Most recently, Chemical Engineering+ was updated on November 4, 2026 and Rew on October 31, 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.*