# ReactionFlash vs NMR Calculator 2

The clearest difference is update cadence: ReactionFlash at every 4 months against NMR Calculator 2's every 33 months. ReactionFlash also leads on iOS requirement (14.0 vs 26.0). On price, ads, 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.

ReactionFlash ships an update every 4 months, NMR Calculator 2 every 33 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ReactionFlash | NMR Calculator 2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (42 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 33 months |
| Monetization | Free | — |
| Size | 37 MB | 2 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Jae-Seung Lee](https://appshunter.io/developer/1146296876) |

## 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


### NMR Calculator 2

[App page](https://appshunter.io/ios/app/nmr-calculator-2/id6466729022)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is NMR Calculator 2 free?

NMR Calculator 2 is free to download, with no in-app purchases.

### Do ReactionFlash or NMR Calculator 2 have ads?

Neither ReactionFlash nor NMR Calculator 2 shows ads.

### Which is updated more often, ReactionFlash or NMR Calculator 2?

ReactionFlash ships an update every 4 months, and NMR Calculator 2 every 33 months. Most recently, ReactionFlash was updated on October 23, 2026 and NMR Calculator 2 on October 30, 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.*