# ReactionFlash vs Chemical Structures Quiz

The clearest difference is price: ReactionFlash at Free against Chemical Structures Quiz's $3.99. ReactionFlash also leads on review sentiment (81% vs 50%). Chemical Structures Quiz's advantage is iOS requirement (11.0 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

ReactionFlash is free to download; Chemical Structures Quiz costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReactionFlash ships an update every 4 months, Chemical Structures Quiz every 2 months. The most recent releases landed on September 21, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Chemical Structures Quiz |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | **80.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 37 MB | 12 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Marijn Dillen](https://appshunter.io/developer/1276712320) |

## 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 Structures Quiz

[App page](https://appshunter.io/ios/app/chemical-structures-quiz/id1397168183)

Test your knowledge of organic and biochemical compounds with multiple-choice quizzes. Learn systematic and common names for hydrocarbons, functional groups, and biomolecules. Ideal for high school students studying chemistry.

**Highlights:** Multiple-choice quizzes, Learn systematic and common names, Covers hydrocarbons, functional groups, biomolecules, Offline functionality, No advertisements

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

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Chemical Structures Quiz free?

Chemical Structures Quiz costs $3.99, with no in-app purchases.

### Do ReactionFlash or Chemical Structures Quiz have ads?

Neither ReactionFlash nor Chemical Structures Quiz shows ads.

### Which is updated more often, ReactionFlash or Chemical Structures Quiz?

ReactionFlash ships an update every 4 months, and Chemical Structures Quiz every 2 months. Most recently, ReactionFlash was updated on September 21, 2026 and Chemical Structures Quiz on September 7, 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.*