PhiStruct

Build ball-and-strut polyhedra by touch, explore 134 guided models, place them in AR on iPhone and iPad, and export for 3D printing. One-time purchase. Fully offline.

PhiStruct is a touch-first ball-and-strut geometry builder: you don't just view finished shapes — you construct them.

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 on your desk.

On iPhone and iPad, place a finished model on a table in AR. Mac has no table AR — mouse, trackpad, and menus only.

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 in real life • 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 134 curated polyhedra (flat shapes, prisms, Platonic and Archimedean solids, quasicrystal geometry) with the next hole highlighted, or complete instantly • Reference ghost — a 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, including .vZome from desktop vZome

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 • Geometry lovers who want to make something, not just look at it

One-time purchase. Your projects stay on your device unless you export them.