# ReactionFlash vs Chemist Calc

The clearest difference is in-app purchases: ReactionFlash at none against Chemist Calc's 1. ReactionFlash also leads on ratings volume (41 vs 1) and update cadence (every 4 months vs every 9 months). Chemist Calc's advantage is rating (5.0 vs 4.8). On price, ads, monetization model and device support there is nothing between them.

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

Chemist Calc 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 1, so its average is the more settled of the two.

ReactionFlash ships an update every 4 months, Chemist Calc every 9 months. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Chemist Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chemist-calc/id1052603017/reviews)** |
| Number of ratings | **41** | 1 |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free | Free |
| Size | 37 MB | 11 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) |

## 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


### Chemist Calc

[App page](https://appshunter.io/ios/app/chemist-calc/id1052603017)

This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.

**Highlights:** Mole to gram conversion, Gram to mole conversion, Periodic table with element specifications, Unit conversion, Learn chemistry signs

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad's | $0.99 | one-time |


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Chemist Calc free?

Chemist Calc is free to download, with in-app purchases available.

### Which has better reviews, ReactionFlash or Chemist Calc?

Chemist Calc is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Chemist Calc averages 5.0 from 1 ratings.

### Do ReactionFlash or Chemist Calc have ads?

Neither ReactionFlash nor Chemist Calc shows ads.

### Which is updated more often, ReactionFlash or Chemist Calc?

ReactionFlash ships an update every 4 months, and Chemist Calc every 9 months. Most recently, ReactionFlash was updated on October 7, 2026 and Chemist Calc on September 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.*