TopOpt vs Cat Liquid Slide Puzzle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TopOpt
Explore structural engineering concepts with an interactive topology optimization tool. Design and visualize optimized structures in real-time by placing loads and supports. Supports advanced features like volume and stress constraints for detailed analysis.
- Real-time structure updates
- Minimum compliance optimization
- Compliant mechanisms design
- Local volume and stress constraints
- Robust formulation for design insensitivity
- STL export for 3D printing
- Interactive load and support placement
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TopOpt is an interactive topology optimization app from the TopOpt group at the Technical University of Denmark (DTU). Place loads and supports, and the optimized structure appears and updates in real time while you edit. Two problem types: • Minimum compliance: the stiffest structure for a given amount of material • Compliant mechanisms: a force inverter and a gripper, with input and output ports and their springs Both can be extended with: • A local volume constraint for bone-like porous infill • A von Mises stress constraint, with the stress field shown on the design • The robust formulation, which makes the design insensitive to its members being made thinner or thicker Further features: • Presets: MBB beam, L-bracket, cantilever and femur, and force inverter and gripper for mechanisms • Up to six loads and three load cases, and scaled loads • Loads, supports and ports are moved by dragging their symbols, and loads and ports can be rotated • Passive solid and void regions, and flexible void regions that the optimization may move • Custom grid size, sharpness and filter radius • Export of the design as an STL file for 3D printing The same app runs on iPhone, iPad, macOS, Windows and Linux. A user guide with tutorials is available on the TopOpt homepage.
Cat Liquid Slide Puzzle
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**Neko Liquid Cat Ball Slide Puzzle** Slide the cute cat balls to clear the 10 stages of brain training puzzles in the shortest time possible! This simple but addictive slide puzzle will help you train your thinking skills while you beat your own best time or compete against your friends for the fastest time. **The rules are simple**: Just match the pieces as shown in the picture above! The more you play, the clearer your mind becomes, and you may be surprised how quickly you can clear the puzzle! **Minimal Ads**: Only 2 ads per play. Paid option to hide ads is also available. Download now and stimulate your brain with Nekodama puzzles! Voice “VOICEVOX: Sakura Uta Miko” BGM Crystal Fantasia by Edamame88 Galaxy Runner by MFP [Marron Fields Production
Screenshots
Verdict
The clearest difference is in-app purchases: TopOpt at none against Cat Liquid Slide Puzzle's 1. TopOpt also leads on ads (none vs shown). Cat Liquid Slide Puzzle's advantage is update cadence (every 3 weeks vs every 4 months). On price, device support and iOS requirement 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
Both are free to download. Cat Liquid Slide Puzzle sells 1 one-off in-app purchase. TopOpt asks for nothing beyond the download.
TopOpt ships an update every 4 months, Cat Liquid Slide Puzzle every 3 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | TopOpt | Cat Liquid Slide Puzzle |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 51 MB | 143 MB |
| Age rating | 4+ | 4+ |
| Developer | DTU Mechanical Engineering | Yusuke Okada |
In-app purchases
TopOpt
No in-app purchases
Cat Liquid Slide Puzzle
- [Remove Ads]$0.49
Questions
Is TopOpt free?
Is Cat Liquid Slide Puzzle free?
Do TopOpt or Cat Liquid Slide Puzzle have ads?
Which is updated more often, TopOpt or Cat Liquid Slide Puzzle?
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