# ReactionFlash vs Tap OChem

The clearest difference is price: ReactionFlash at Free against Tap OChem's $4.99. Tap OChem's advantage is review sentiment (92% vs 81%). On rating, ratings volume, update cadence and ads there is nothing between them.

ReactionFlash is free to download; Tap OChem costs $4.99 up front. 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 4.7 for Tap OChem. Both are backed by a comparable volume of ratings — 41 and 39 respectively. Written reviews are what separate them: 81% of ReactionFlash's written reviews are positive against 92% of Tap OChem's.

ReactionFlash ships an update every 4 months, Tap OChem every 3 months. The most recent releases landed on October 7, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Tap OChem |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [4.7 (39 ratings)](https://appshunter.io/ios/app/tap-ochem/id579861146/reviews) |
| Number of ratings | **41** | 39 |
| Positive reviews | 80.6% of reviews | **91.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 37 MB | 3.5 GB |
| Requires iOS | 14.0 | **13.2** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Tap OChem, LLC](https://appshunter.io/developer/579861209) |

## 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


### Tap OChem

[App page](https://appshunter.io/ios/app/tap-ochem/id579861146)

Visualize complex organic chemistry reactions and concepts with animated explanations. This app covers a wide range of undergraduate organic chemistry topics, aiding in exam preparation and understanding of molecular behavior.

**Highlights:** Animated organic chemistry reactions, Detailed concept explanations, Electron pushing diagrams, Full-color text descriptions, MCAT, PCAT, OAT, DAT prep, Regular content updates

**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 Tap OChem free?

Tap OChem costs $4.99, with no in-app purchases.

### Which has better reviews, ReactionFlash or Tap OChem?

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Tap OChem averages 4.7 from 39 ratings.

### Do ReactionFlash or Tap OChem have ads?

Neither ReactionFlash nor Tap OChem shows ads.

### Which is updated more often, ReactionFlash or Tap OChem?

ReactionFlash ships an update every 4 months, and Tap OChem every 3 months. Most recently, ReactionFlash was updated on October 7, 2026 and Tap OChem on September 23, 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.*