PhiStruct

Build. Lock. Set it on the table.

Build real geometry with your hands.

Tap a hole, place a strut. Struts never pass through each other — so if it builds in the app, it builds on your desk. Then place it in AR at room scale.

  • Collision-proof
  • 134 guided models
  • AR at room scale
  • One-time purchase

Download on the App Store

A finished build placed on a real table in AR
Kepler star with the five strut-color picker open

How it works

1

Tap a hole, place a strut

Start from a single ball and build up. Ghost pegs show exactly where the next strut can lock.

2

Guided builds or freehand

Step through 134 curated polyhedra hole-by-hole, or free build against a translucent reference ghost.

3

Place it on a real table

Preview any build in AR at room scale. Then export PNG, GLB, STL, or .vZome — plus a parts list.

Kepler star with the five strut-color picker open
Build freely by touch
Model Library on the Hard aisle, Rainbow Core in view
134 guided 3D models
A finished build placed on a real table in AR
Place every model in AR
Export sheet for PNG, GLB, STL, and vZome
Export PNG, GLB, STL, vZome
Guided Square Pyramid with the next hole lit
The next hole lights up
Rainbow Core using blue, red, yellow, and green struts
All five strut colors

Watch a guided build

Small stellated dodecahedron — hook, build, export.

Offline, one-time purchase, no account.

No ads, no subscriptions, no tracking. Your projects stay on your device.

Download on the App Store