# ReactionFlash vs Structural Formulas Study

The clearest difference is ratings volume: ReactionFlash at 42 against Structural Formulas Study's 1. ReactionFlash also leads on iOS requirement (15.5 vs 18.4). Structural Formulas Study's advantage is update cadence (every 5 weeks vs every 4 months) and rating (5.0 vs 4.8). 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.

Structural Formulas Study holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ReactionFlash has 42 ratings behind it against 1, so its average is the more settled of the two.

ReactionFlash ships an update every 4 months, Structural Formulas Study every 5 weeks. The most recent releases landed on November 10, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (42 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/structural-formulas-study/id6752260162/reviews)** |
| Number of ratings | **42** | 1 |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 40 MB | 5 MB |
| Requires iOS | **15.5** | 18.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### ReactionFlash

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

This app helps students and chemists review and understand named chemical reactions, their mechanisms, and examples from scientific literature. It functions like flashcards and includes a quiz mode to test knowledge.

**Highlights:** Learn named chemical reactions, Understand reaction mechanisms, View literature examples, Quiz mode for knowledge testing, Flashcard-style learning, Extensive collection of reactions

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

**In-app purchases:** none


### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

Explore and study over 100 molecular structures with detailed properties and clear diagrams. This app offers quick search and filtering for efficient exam preparation and daily learning, with offline access available.

**Highlights:** 100+ molecular structures, Detailed structural formulas, Essential chemical properties, Quick search and filters, Offline access, Exam preparation tool

**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 Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Which has better reviews, ReactionFlash or Structural Formulas Study?

Structural Formulas Study is rated higher. ReactionFlash averages 4.8 out of 5 from 42 ratings, while Structural Formulas Study averages 5.0 from 1 ratings.

### Do ReactionFlash or Structural Formulas Study have ads?

Neither ReactionFlash nor Structural Formulas Study shows ads.

### Which is updated more often, ReactionFlash or Structural Formulas Study?

ReactionFlash ships an update every 4 months, and Structural Formulas Study every 5 weeks. Most recently, ReactionFlash was updated on November 10, 2026 and Structural Formulas Study on November 8, 2026.

---

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