# ReactionFlash vs Functional Groups

The clearest difference is in-app purchases: ReactionFlash at none against Functional Groups's 1. Functional Groups's advantage is review sentiment (100% vs 81%). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Functional Groups sells 1 one-off in-app purchase. ReactionFlash asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for ReactionFlash against 4.9 for Functional Groups. Both are backed by a comparable volume of ratings — 41 and 21 respectively. Written reviews are what separate them: 81% of ReactionFlash's written reviews are positive against 100% of Functional Groups's.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Functional Groups |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[4.9 (21 ratings)](https://appshunter.io/ios/app/functional-groups/id1670252638/reviews)** |
| Number of ratings | **41** | 21 |
| Positive reviews | 80.6% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 37 MB | 17 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Clarity Applications](https://appshunter.io/developer/1646120472) |

## 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


### Functional Groups

[App page](https://appshunter.io/ios/app/functional-groups/id1670252638)

Master organic chemistry functional groups through an engaging and interactive learning experience. Ideal for students in introductory or advanced courses, MCAT prep, and A-Level chemistry, this app covers dozens of essential groups with practice modes and progress tracking.

**Highlights:** 25+ basic and advanced functional groups, 300+ organic compounds, Multiple practice modes, Customizable study groups, Personalized review, Reference table and definitions, Progress tracking with achievements

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Functional Groups free?

Functional Groups is free to download, with in-app purchases available.

### Which has better reviews, ReactionFlash or Functional Groups?

Functional Groups is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Functional Groups averages 4.9 from 21 ratings.

### Do ReactionFlash or Functional Groups have ads?

Neither ReactionFlash nor Functional Groups shows ads.

### Which is updated more often, ReactionFlash or Functional Groups?

ReactionFlash ships an update every 4 months, and Functional Groups every 4 months. Most recently, ReactionFlash was updated on September 21, 2026 and Functional Groups on September 13, 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.*