# TopOpt vs AL CHEM

The clearest difference is price: TopOpt at Free against AL CHEM's $11.99. TopOpt also leads on in-app purchases (none vs 2) and iOS requirement (11.0 vs 15.0). AL CHEM's advantage is review sentiment (100% vs 67%) and ratings volume (8 vs 2). On rating, update cadence, ads and device support there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for TopOpt against 5.0 for AL CHEM. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews are what separate them: 67% of TopOpt's written reviews are positive against 100% of AL CHEM's.

TopOpt ships an update every 3 months, AL CHEM every 4 months. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | TopOpt | AL CHEM |
| --- | --- | --- |
| Price | **Free** | $11.99 |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/topopt/id507454646/reviews) | [5.0 (8 ratings)](https://appshunter.io/ios/app/al-chem/id987341808/reviews) |
| Number of ratings | 2 | **8** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | **Free** | Paid |
| Size | 100 MB | 60 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [DTU Mechanical Engineering](https://appshunter.io/developer/507453160) | [东东 张](https://appshunter.io/developer/987341807) |

## What reviewers say

### TopOpt

[App page](https://appshunter.io/ios/app/topopt/id507454646)

This app allows users to perform structural optimization using topology optimization methods on their iPad or iPhone. Users can manipulate loads and supports to observe design evolution and experiment with various parameters like volume fractions and grid sizes.

**Highlights:** Topology optimization method, Structural design evolution, Load and support manipulation, Volume fraction experimentation, Grid size adjustments

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is TopOpt free?

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

### Is AL CHEM free?

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

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

TopOpt and AL CHEM are both rated 5.0 out of 5 on the App Store, from 2 and 8 ratings respectively.

### Do TopOpt or AL CHEM have ads?

Neither TopOpt nor AL CHEM shows ads.

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

TopOpt ships an update every 3 months, and AL CHEM every 4 months. Most recently, TopOpt was updated on October 6, 2026 and AL CHEM on October 13, 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.*