Draw a flat sheet.
Look at it from the inside.
Papercube is an app for drawing the flat net of a cube: six faces laid out in a cross, like a box to cut out and fold. While you draw, the 3D rendering keeps up and the camera stays at the centre of the cube — the flat drawing and the folded object are the same thing seen two ways.
It is not a 3D editor: you never touch a three-dimensional object. You draw with real brushes — pressure, width, hardness — and the cube updates on its own.
Universal iPad and iPhone · iPhone is view-onlyA cross of six squares
Lid, left, front, right, back, bottom: six squares on a 4000×3000 canvas, each in its place. Every square becomes a face of the cube, and the edges that touch in the drawing are the ones that meet in the volume.
- Six faces
- Lid, left, front, right, back, bottom
- Preview
- The 3D keeps up while you draw, with no export
- Camera
- Always at the centre of the cube, like a photosphere
The vanishing lines are automatic
A fan of rays spreads out from the centre of every face — 24 out of the box, adjustable — with the horizon marked on the four side faces. It is not decoration: these are the real vanishing points of the projection.
Following them is enough to draw in correct perspective without knowing any perspective.
A real drawing editor
Layers you add, reorder, hide and duplicate. Brushes with pressure, an eraser, a history of your last ten colours, undo and redo up to ten steps. The 3D preview stays next to the sheet, in real time.
- Layers
- Add, reorder, hide, duplicate
- Brushes
- Pressure, width, hardness, eraser
- Colour
- A history of the last ten colours used
- History
- Undo and redo up to ten steps
You share a link, not a file
"Share a 3D link" uploads the six faces and hands back an address. Whoever opens it sees the cube in the browser, from the inside, read-only: no login, and nothing to install just to look.
Open an example link →the six faces upload, then you copy or open the address
past the deadline the link goes dark, and the page says so
equirectangular, the format headsets and other viewers read
one image per face, straight from the flat net
iPad to draw, iPhone to look
The app is universal, but the roles differ on purpose. Your drawing saves itself and syncs between your devices through iCloud: no account to create, no login.
Where the drawing happens
The cross-shaped sheet, brushes, layers and the 3D preview alongside. This is where a cube is born.
Library and full-screen view
Cubes arrive from iCloud and you look at them from the inside, full screen, read-only. It is not a second editor.
No account, anywhere
Your cubes live in iCloud, tied to your Apple account, and they are the same ones on iPad and iPhone. A shared link opens nothing but a read-only copy: the address itself is the credential, and after thirty days it stops working. Whoever looks does not have to sign up, and cannot change your original.