# ReactionFlash vs Molecular Formula Generator

The clearest difference is update cadence: ReactionFlash at every 4 months against Molecular Formula Generator's every 16 months. ReactionFlash also leads on ratings volume (41 vs 3). Molecular Formula Generator's advantage is rating (5.0 vs 4.8) and iOS requirement (7.0 vs 14.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Molecular Formula Generator holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ReactionFlash has 41 ratings behind it against 3, so its average is the more settled of the two.

ReactionFlash ships an update every 4 months, Molecular Formula Generator every 16 months. The most recent releases landed on September 21, 2026 and June 6, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Molecular Formula Generator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/molecular-formula-generator/id646768652/reviews)** |
| Number of ratings | **41** | 3 |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 16 months |
| Monetization | Free | Free |
| Size | 37 MB | 3 MB |
| Requires iOS | 14.0 | **7.0** |
| Devices | iPhone, iPod | iPhone, 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


### Molecular Formula Generator

[App page](https://appshunter.io/ios/app/molecular-formula-generator/id646768652)

This app generates a comprehensive list of molecular formulas based on mass spectrometry data and elemental composition. Users can specify m/z values, mass accuracy, and potential elements to find matching formulas. The generated lists can be shared via email.

**Highlights:** Generate molecular formulas by m/z value, Specify mass accuracy, Define elemental composition, Include double bond equivalents, Share formula lists via email

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Molecular Formula Generator free?

Molecular Formula Generator is free to download, with no in-app purchases.

### Which has better reviews, ReactionFlash or Molecular Formula Generator?

Molecular Formula Generator is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Molecular Formula Generator averages 5.0 from 3 ratings.

### Do ReactionFlash or Molecular Formula Generator have ads?

Neither ReactionFlash nor Molecular Formula Generator shows ads.

### Which is updated more often, ReactionFlash or Molecular Formula Generator?

ReactionFlash ships an update every 4 months, and Molecular Formula Generator every 16 months. Most recently, ReactionFlash was updated on September 21, 2026 and Molecular Formula Generator on June 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*