TopOpt vs AL CHEM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TopOpt
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.
- Topology optimization method
- Structural design evolution
- Load and support manipulation
- Volume fraction experimentation
- Grid size adjustments
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Use your iPad/iPhone to perform structural optimization by the topology optimization method ! Move loads and supports and watch the design evolve to a new minimum. Experiment with different volume fractions and grid sizes and see what happens.
AL CHEM
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.
- A Level Chemistry teaching notes
- Flash cards for revision
- Quizzes with explanations
- Useful chemistry learning tools
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This app is designed to improve your learning experience. In this App, you can find or do the followings: 1. My teaching notes of A Level Chemistry; 2. Flash Cards; 3. Quiz with brief explanations; 4. Some useful tools for learning chemistry If you are a student who is studying A-Level, AP, or SAT Chemistry , this app will be very helpful to your study!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TopOpt | AL CHEM |
|---|---|---|
| Price | Free — better | $11.99 |
| Rating | 5.0 (2 ratings) | 5.0 (8 ratings) |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 8 — better |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 100 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | DTU Mechanical Engineering | 东东 张 |
Customer experience
TopOpt
AL CHEM
In-app purchases
TopOpt
No in-app purchases
AL CHEM
- Flash Cards$4.99
- Test$5.99
