# Past Code vs Unreal Chemist

The clearest difference is rating: Unreal Chemist at 4.5 against Past Code's 4.0. Unreal Chemist also leads on review sentiment (73% vs 50%) and ratings volume (67 vs 4). Past Code's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

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

Unreal Chemist holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Unreal Chemist has 67 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of Past Code's written reviews are positive against 73% of Unreal Chemist's.

Past Code ships an update every 6 days, Unreal Chemist every 2 weeks. The most recent releases landed on September 26, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Past Code | Unreal Chemist |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/past-code/id1551535957/reviews) | **[4.5 (67 ratings)](https://appshunter.io/ios/app/unreal-chemist/id1597689215/reviews)** |
| Number of ratings | 4 | **67** |
| Positive reviews | 50.0% of reviews | **73.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 32 MB | 342 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Omar Rayyan](https://appshunter.io/developer/1551535959) | [ZipoApps](https://appshunter.io/developer/1671444635) |

## What reviewers say

### Past Code

[App page](https://appshunter.io/ios/app/past-code/id1551535957)

Instantly find mark schemes for IGCSE and A-Level past papers by scanning their codes with your camera. Save time and effort by accessing the correct resources directly.

**Highlights:** Scan past paper codes with camera, Instant mark scheme retrieval, Supports IGCSE papers, Supports A-Level papers, User-friendly 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 Past Code free?

Past Code 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, Past Code or Unreal Chemist?

Unreal Chemist is rated higher. Past Code averages 4.0 out of 5 from 4 ratings, while Unreal Chemist averages 4.5 from 67 ratings.

### Do Past Code or Unreal Chemist have ads?

Unreal Chemist shows ads; Past Code does not.

### Which is updated more often, Past Code or Unreal Chemist?

Past Code ships an update every 6 days, and Unreal Chemist every 2 weeks. Most recently, Past Code was updated on September 26, 2026 and Unreal Chemist on October 3, 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.*