# ReactionFlash vs Unreal Chemist

The clearest difference is in-app purchases: ReactionFlash at none against Unreal Chemist's 1. ReactionFlash also leads on ads (none vs shown) and rating (4.8 vs 4.5). Unreal Chemist's advantage is update cadence (every 2 weeks vs every 4 months) and iOS requirement (11.0 vs 14.0). On price, review sentiment, ratings volume and device support there is nothing between them.

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

ReactionFlash holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 41 and 67 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 73% of Unreal Chemist's.

ReactionFlash ships an update every 4 months, Unreal Chemist every 2 weeks. Both last shipped on October 16, 2026.

## The numbers

| Metric | ReactionFlash | Unreal Chemist |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [4.5 (67 ratings)](https://appshunter.io/ios/app/unreal-chemist/id1597689215/reviews) |
| Number of ratings | 41 | **67** |
| Positive reviews | **80.6% of reviews** | 73.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 37 MB | 342 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## 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


### Unreal Chemist

[App page](https://appshunter.io/ios/app/unreal-chemist/id1597689215)

Explore a virtual chemistry lab on your phone. Mix chemicals, observe reactions, and conduct over 750 unique simulations with more than 150 available substances. Adjust variables like temperature and concentration to understand chemical principles.

**Highlights:** Mix chemicals for reactions, Burn salts for colorful flames, Heat elements for color emission, Adjust reactant concentration and quantity, Regulate reaction temperature, Control time flow (slow/fast forward), Monitor pH changes with indicators

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Version | $5.99 | one-time |

**What reviewers like**

- ✨ Very educational for chemistry students
- 👍 Realistic looking and lots to do
- 🌟 Contains a heap of information
- 👍 Ads are occasional and not deterring
- 🚀 Amazing graphics and advanced features

**What reviewers complain about**

- 🐛 Some reactions are inaccurate
- 🐛 Buggy interface and features
- 💸 Many features behind a paywall
- 😩 Ads can be excessive
- 🤔 Free version is uninspiring

**Reported bugs**

- Sulfuric acid not dissolving with salts
- Heating solution during titration
- Watch ad for premium session not working
- Mixing game not always working intuitively
- Buttons on iPhone blocked by camera

**Requested features**

- Add more elements (e.g., Mn, H, O, Cl, F, Pb)
- Add more acids (e.g., Chloroauric acid, Vanadic acid, Perrhenic acid)
- Add more bases and solvents (e.g., styrofoam, polystyrene, ethanol, acetone)
- Add gases (e.g., Chlorine, Fluorine, Hydrogen, Oxygen)
- Option to specify amounts of chemicals to add


## Frequently asked questions

### Is ReactionFlash free?

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

### Is Unreal Chemist free?

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

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

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Unreal Chemist averages 4.5 from 67 ratings.

### Do ReactionFlash or Unreal Chemist have ads?

Unreal Chemist shows ads; ReactionFlash does not.

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

ReactionFlash ships an update every 4 months, and Unreal Chemist every 2 weeks. Most recently, ReactionFlash was updated on October 16, 2026 and Unreal Chemist on October 16, 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.*