PhiStruct

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.