PhiStruct
Build 3D Polyhedra by Touch
$4.99 · Designed for iPad. Not verified for macOS.
Assemble real ball-and-strut models by touch — collision-proof, 66 guided builds, STL export for 3D printing. One-time purchase. Fully offline.
PhiStruct lets you build real 3D geometry by touch — not just view finished shapes.
Tap a connector ball, tap a glowing hole, and place a strut. Keep going until you've assembled Platonic solids, Archimedean solids, golden-ratio forms, and more. Struts are never allowed to pass through each other, so every model is physically buildable.
WHY IT'S DIFFERENT
• Hands-on construction, hole by hole — like a strut kit in your pocket
• Collision-proof builds: if it builds in the app, it builds on your desk
• Exact φ (golden ratio) math — zero drift
• Fully offline. No account. No ads. No subscription.
WHAT YOU CAN DO
• Free build — pick color and length, tap holes, invent your own models
• Guided builds — step through 66 curated models (flat shapes, prisms, polyhedra, quasicrystal geometry) with the next hole highlighted, or complete instantly
• Reference ghost — translucent target to build alongside freehand
• Parts list — color × length × count for sorting or buying real struts
• Export PNG, full-color GLB (Blender / AR / web), or centered STL for 3D printing
• Save and reopen exact project files
WHO IT'S FOR
• Makers and 3D-printing hobbyists who want to verify a build before printing
• Math teachers preparing a polyhedra lesson — walk through it step by step
• Anyone who loves geometry and wants to make something, not just look at it
One-time purchase. Your projects stay on your device unless you export them.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, 箫 王, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 箫 王
- Size
- 7.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 王箫 (Xiao Wang)
