# ReactionFlash vs Perse Visualizer

The clearest difference is ads: ReactionFlash at none against Perse Visualizer's shown. ReactionFlash also leads on review sentiment (81% vs 50%) and monetization model (free vs ad-supported). Perse Visualizer's advantage is rating (5.0 vs 4.8) and update cadence (every 2 months vs every 4 months). On price, in-app purchases and device support there is nothing between them.

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

Perse Visualizer 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 7, so its average is the more settled of the two. Written reviews complicate that: 81% of ReactionFlash's written reviews are positive against 50% of Perse Visualizer's, so the app with the better star average is not the one people write more warmly about.

ReactionFlash ships an update every 4 months, Perse Visualizer every 2 months. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Perse Visualizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/perse-visualizer/id1476999836/reviews)** |
| Number of ratings | **41** | 7 |
| Positive reviews | **80.6% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 37 MB | 24 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) | [Dylan Riffle](https://appshunter.io/developer/1142744409) |

## 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


### Perse Visualizer

[App page](https://appshunter.io/ios/app/perse-visualizer/id1476999836)

Visualize protein structures on your mobile device. Search the protein data bank by name or ID and display them in various styles like cartoon or ball and stick. Ideal for biology students and researchers.

**Highlights:** Protein visualization, Search by name or ID, Multiple display styles, Access to protein data bank, Educational tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Perse Visualizer free?

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

### Which has better reviews, ReactionFlash or Perse Visualizer?

Perse Visualizer is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Perse Visualizer averages 5.0 from 7 ratings.

### Do ReactionFlash or Perse Visualizer have ads?

Perse Visualizer shows ads; ReactionFlash does not.

### Which is updated more often, ReactionFlash or Perse Visualizer?

ReactionFlash ships an update every 4 months, and Perse Visualizer every 2 months. Most recently, ReactionFlash was updated on September 21, 2026 and Perse Visualizer on September 9, 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.*