Turn this screen into a hole in the wall. The front camera finds your eyes, and the world behind the glass shifts to match your real point of view.
Everything runs on-device. No video leaves the phone.
Calibration takes about thirty seconds.
Hold the device still and move your head.
1 How big is this screen, really?
The illusion is pure geometry, so the app needs the physical size of a pixel — and no browser will tell it. Every bank card, ID and driving licence on earth is the same size, so hold one against the screen and stretch the gauge until its ends meet the card's edge.
53.98 mm
–px per cm
–screen diagonal
No card handy?
2 Find your face
Allow the camera, then check that the tracker locks on. Even light on your face helps; a bright window behind you hurts.
starting…
3 Point your face at the camera
Bring your eyes straight in front of the lens itself — as if it were a peephole you were about to look through. Stay at a comfortable arm's length, then hold still. This teaches the app where the lens is actually pointing.
face straight in front of the lens
ready
4 Now point it at the centre of the screen
A target has appeared in the middle of the glass. Move your head until your eyes are straight in front of it, square-on, at that same comfortable distance — then hold still. The gap between this answer and the last one is the offset between lens and screen.
ready
Calibrated
This is where the app now believes the lens sits, measured out from the centre of the canvas.
–lens, left / right
–lens, up / down
–your distance
–window size
Not convincing? Open ⚙ and nudge the field of view. It is the one number nothing else can measure for you.
Pointer mode
No camera, no calibration. Drag anywhere to move a virtual head, and scroll to push it closer or further away. Handy for checking the scene on a desktop.