Comparison

TopOpt vs Cat Liquid Slide Puzzle

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Cat Liquid Slide Puzzle

Features
Read full description

**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

TopOpt4 screens
Cat Liquid Slide Puzzle3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Cat Liquid Slide Puzzle sells 1 one-off in-app purchase. TopOpt asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
TopOpt versus Cat Liquid Slide Puzzle: the parameters behind the verdict, then further details
ParameterTopOptCat Liquid Slide Puzzle
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings2 — better—
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size51 MB143 MB
Age rating4+4+
DeveloperDTU Mechanical EngineeringYusuke Okada

In-app purchases

None

TopOpt

No in-app purchases

1 purchases

Cat Liquid Slide Puzzle

One-time1
  • [Remove Ads]$0.49

Questions

Is TopOpt free?
TopOpt is free to download, with no in-app purchases.
Is Cat Liquid Slide Puzzle free?
Cat Liquid Slide Puzzle is free to download, with in-app purchases available.
Do TopOpt or Cat Liquid Slide Puzzle have ads?
Cat Liquid Slide Puzzle shows ads; TopOpt does not.
Which is updated more often, TopOpt or Cat Liquid Slide Puzzle?
TopOpt ships an update every 4 months, and Cat Liquid Slide Puzzle every 3 weeks. Most recently, TopOpt was updated on November 1, 2026 and Cat Liquid Slide Puzzle on October 30, 2026.

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