π² To keep Doodle Zoo on your home screen: tap Shareβ¬οΈ then Add to Home Screen.
For grown-ups: how it works
Cut-out. The photo is white-balanced against the paper, the crayon lines are found, small gaps are sealed and the outline is filled, so even a plain outline drawing becomes a solid creature.
Inflate. A distance field gives every part a round cross-section sized to its own thickness. A fat body becomes a dome and a thin leg becomes a tube. The drawing itself is the skin.
Auto-rig. A morphological opening separates the chunky body from thin parts. Each part's direction and position decide what it is: leg, tail, ear, wing or arm. It also finds the eyes the kid drew to work out which way the creature faces.
Animate. No keyframes. Every vertex is moved every frame by procedural gaits (walk, hop, slither, fly, jelly-bounce), wagging tails, springy ears, flapping wings and googly eyes with pupil physics.
Draw into the world. In the zoo, ποΈ lets kids draw right on top of the camera view. The drawing peels off the screen and lands where they drew it, at the size they drew it, as a new creature, some food or a toy.
AR. On Android Chrome it's real WebXR AR (tap the floor). On iPhone and iPad it uses the camera with the gyroscope. Anywhere else there's a toy room.
π Everything else runs on this device. Photos are never uploaded, and creatures are saved only on this phone. The microphone (for clapping) is only used while π is on and is never recorded.