# ReactionFlash vs Illusio

The clearest difference is ads: ReactionFlash at none against Illusio's shown. Illusio's advantage is update cadence (every 8 days vs every 4 months). On price, in-app purchases, device support and iOS requirement 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, Illusio every 8 days. The most recent releases landed on September 21, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Illusio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 37 MB | 59 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Mind Mirage Apps Ltd](https://appshunter.io/developer/1896465995) |

## 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


### Illusio

[App page](https://appshunter.io/ios/app/illusio/id6771068807)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Illusio free?

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

### Do ReactionFlash or Illusio have ads?

Illusio shows ads; ReactionFlash does not.

### Which is updated more often, ReactionFlash or Illusio?

ReactionFlash ships an update every 4 months, and Illusio every 8 days. Most recently, ReactionFlash was updated on September 21, 2026 and Illusio on September 8, 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.*