# ReactionFlash vs Backside Attack

ReactionFlash and Backside Attack both sit at 4.8 stars, but that hides the real split: 95% of Backside Attack's written reviews are positive against 81% of ReactionFlash's. Backside Attack also leads on device support (4 vs 2) and iOS requirement (9.0 vs 14.0). On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for ReactionFlash against 4.9 for Backside Attack. Both are backed by a comparable volume of ratings — 41 and 74 respectively. Written reviews are what separate them: 81% of ReactionFlash's written reviews are positive against 95% of Backside Attack's.

ReactionFlash ships an update every 4 months, Backside Attack every 8 months. The most recent releases landed on September 21, 2026 and July 4, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Backside Attack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[4.9 (74 ratings)](https://appshunter.io/ios/app/backside-attack/id1278956096/reviews)** |
| Number of ratings | 41 | **74** |
| Positive reviews | 80.6% of reviews | **95.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 8 months |
| Monetization | Free | Free |
| Size | 37 MB | 178 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Element26, Inc.](https://appshunter.io/developer/973213639) |

## 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


### Backside Attack

[App page](https://appshunter.io/ios/app/backside-attack/id1278956096)

This educational game helps students grasp fundamental organic chemistry concepts, specifically focusing on the SN2 reaction. It explores key variables like leaving group ability, nucleophilicity, steric factors, and solvent effects to build a strong foundation in chemistry.

**Highlights:** Learn SN2 reaction mechanics, Explore leaving group ability, Understand nucleophilicity, Analyze steric factors, Study solvent effects, Earn points with Check Yourself +50, Unlock Chem Yourself feature

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Backside Attack free?

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

### Which has better reviews, ReactionFlash or Backside Attack?

Backside Attack is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Backside Attack averages 4.9 from 74 ratings.

### Do ReactionFlash or Backside Attack have ads?

Neither ReactionFlash nor Backside Attack shows ads.

### Which is updated more often, ReactionFlash or Backside Attack?

ReactionFlash ships an update every 4 months, and Backside Attack every 8 months. Most recently, ReactionFlash was updated on September 21, 2026 and Backside Attack on July 4, 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.*