# ReactionFlash vs Chemical Engineering+

The clearest difference is review sentiment: ReactionFlash at 81% against Chemical Engineering+'s 0%. ReactionFlash also leads on rating (4.8 vs 3.0) and in-app purchases (none vs 6). Chemical Engineering+'s advantage is update cadence (every 2 months vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Chemical Engineering+ sells 6 in-app purchases, starting at $9.99 per month. ReactionFlash asks for nothing beyond the download.

ReactionFlash holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: ReactionFlash has 42 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 0% of Chemical Engineering+'s.

ReactionFlash ships an update every 4 months, Chemical Engineering+ every 2 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Chemical Engineering+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (42 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/chemical-engineering-plus/id6740001145/reviews) |
| Number of ratings | **42** | 2 |
| Positive reviews | **80.6% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 37 MB | 18 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### ReactionFlash

[App page](https://appshunter.io/ios/app/reactionflash/id432080813)

This app serves as a comprehensive flashcard-style learning tool for named chemical reactions. It provides detailed information on reaction mechanisms and examples from scientific literature, with a quiz mode to test user knowledge.

**Highlights:** Learn named chemical reactions, Understand reaction mechanisms, View literature examples, Quiz mode for knowledge testing, Flashcard interface

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is ReactionFlash free?

ReactionFlash is free to download, with no in-app purchases.

### Is Chemical Engineering+ free?

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

### Which has better reviews, ReactionFlash or Chemical Engineering+?

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 42 ratings, while Chemical Engineering+ averages 3.0 from 2 ratings.

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

Neither ReactionFlash nor Chemical Engineering+ shows ads.

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

ReactionFlash ships an update every 4 months, and Chemical Engineering+ every 2 months. Most recently, ReactionFlash was updated on November 1, 2026 and Chemical Engineering+ on October 30, 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.*