# ReactionFlash vs Molecular Constructor

The clearest difference is rating: ReactionFlash at 4.8 against Molecular Constructor's 3.9. ReactionFlash also leads on update cadence (every 4 months vs every 12 months). Molecular Constructor's advantage is iOS requirement (12.0 vs 14.0). On price, review sentiment, ratings volume 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 3.9. Both are backed by a comparable volume of ratings — 41 and 52 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 75% of Molecular Constructor's.

ReactionFlash ships an update every 4 months, Molecular Constructor every 12 months. The most recent releases landed on September 21, 2026 and August 29, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Molecular Constructor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [3.9 (52 ratings)](https://appshunter.io/ios/app/molecular-constructor/id1299401504/reviews) |
| Number of ratings | 41 | **52** |
| Positive reviews | **80.6% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 37 MB | 10 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Alexander Teplukhin](https://appshunter.io/developer/1299401503) |

## 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 Constructor

[App page](https://appshunter.io/ios/app/molecular-constructor/id1299401504)

Create and optimize 3D molecular models. This free software allows users to design molecules and refine their geometry simultaneously. A more advanced desktop version is also available.

**Highlights:** Build molecules in 3D, Design molecular structures, Optimize geometry, Free software, Desktop version available

**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 Constructor free?

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

### Which has better reviews, ReactionFlash or Molecular Constructor?

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Molecular Constructor averages 3.9 from 52 ratings.

### Do ReactionFlash or Molecular Constructor have ads?

Neither ReactionFlash nor Molecular Constructor shows ads.

### Which is updated more often, ReactionFlash or Molecular Constructor?

ReactionFlash ships an update every 4 months, and Molecular Constructor every 12 months. Most recently, ReactionFlash was updated on September 21, 2026 and Molecular Constructor on August 29, 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.*