# AL CHEM vs LIYSF

The clearest difference is price: LIYSF at Free against AL CHEM's $11.99. LIYSF also leads on in-app purchases (none vs 2) and update cadence (every 2 days vs every 4 months). AL CHEM's advantage is rating (5.0 vs 4.0) and ratings volume (8 vs 1). On review sentiment, ads, device support and iOS requirement there is nothing between them.

LIYSF is free to download; AL CHEM costs $11.99 up front. AL CHEM sells 2 one-off in-app purchases. LIYSF asks for nothing beyond the download.

AL CHEM holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: AL CHEM has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

AL CHEM ships an update every 4 months, LIYSF every 2 days. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AL CHEM | LIYSF |
| --- | --- | --- |
| Price | $11.99 | **Free** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/al-chem/id987341808/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/liysf/id6504500736/reviews) |
| Number of ratings | **8** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | Paid | **Free** |
| Size | 60 MB | 85 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [东东 张](https://appshunter.io/developer/987341807) | [Gustav Brochmann](https://appshunter.io/developer/1710641457) |

## What reviewers say

### AL CHEM

[App page](https://appshunter.io/ios/app/al-chem/id987341808)

Enhance your A-Level Chemistry studies with comprehensive teaching notes, interactive flashcards, and quizzes. This app provides useful tools to aid your learning journey in chemistry.

**Highlights:** A Level Chemistry teaching notes, Flash cards for revision, Quizzes with explanations, Useful chemistry learning tools

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flash Cards | $4.99 | one-time |
| Test | $5.99 | one-time |


### LIYSF

[App page](https://appshunter.io/ios/app/liysf/id6504500736)

This app provides information about a two-week STEM summer camp in the UK, offering lectures, lab visits, and cultural interaction for students aged 16-21. It aims to deepen insight into science and its applications for humankind.

**Highlights:** STEM summer camp details, Online and in-person options, Lectures from leading scientists, Scientific visits to labs and universities, International cultural interaction, Skill development (communication, problem-solving)

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

**In-app purchases:** none


## Frequently asked questions

### Is AL CHEM free?

AL CHEM costs $11.99, and also offers in-app purchases.

### Is LIYSF free?

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

### Which has better reviews, AL CHEM or LIYSF?

AL CHEM is rated higher. AL CHEM averages 5.0 out of 5 from 8 ratings, while LIYSF averages 4.0 from 1 ratings.

### Do AL CHEM or LIYSF have ads?

Neither AL CHEM nor LIYSF shows ads.

### Which is updated more often, AL CHEM or LIYSF?

AL CHEM ships an update every 4 months, and LIYSF every 2 days. Most recently, AL CHEM was updated on October 20, 2026 and LIYSF on October 24, 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.*