# ReactionFlash vs Molecule

The clearest difference is rating: ReactionFlash at 4.8 against Molecule's 4.0. ReactionFlash also leads on ratings volume (41 vs 10). Molecule's advantage is iOS requirement (7.0 vs 14.0). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReactionFlash holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 41 and 10 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 76% of Molecule's.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 21, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Molecule |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [4.0 (10 ratings)](https://appshunter.io/ios/app/molecule/id797331776/reviews) |
| Number of ratings | **41** | 10 |
| Positive reviews | **80.6% of reviews** | 76.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Size | 37 MB | 9 MB |
| Requires iOS | 14.0 | **7.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Kirill Blinov](https://appshunter.io/developer/630833420) |

## 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


### Molecule

[App page](https://appshunter.io/ios/app/molecule/id797331776)

This app allows users to create and share chemical structures with ease. It calculates molecular formula, weight, and elemental composition in real-time as you draw. Ideal for students and researchers needing a simple tool for molecular visualization.

**Highlights:** Draw chemical structures, Share structures, Calculate MF, MW, Monoisotopic Mass, Calculate Elemental Composition, Interactive calculations, Modern interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Molecule free?

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

### Which has better reviews, ReactionFlash or Molecule?

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Molecule averages 4.0 from 10 ratings.

### Do ReactionFlash or Molecule have ads?

Neither ReactionFlash nor Molecule shows ads.

### Which is updated more often, ReactionFlash or Molecule?

ReactionFlash ships an update every 4 months, and Molecule every 4 months. Most recently, ReactionFlash was updated on September 21, 2026 and Molecule on August 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.*