Click or drag over the centers: paint · the background: rotate the view
Click or drag over the stickers: paint · the background: rotate the view
Drag a piece to turn its layer · drag the background to rotate the view · click to pick UDRLFB faces · ⇧ prime · 2…6 + face: inner layer · MES middle
It uses Kociemba's two-phase algorithm, the one behind the best-known solvers: in about a second it finds solutions of around 20 moves at most, and if your cube is one turn away from solved, it gives you that turn. No 3x3 position needs more than 20 moves: that's the so-called "God's number".
It solves the cube with the beginner (layer-by-layer) method, the same one taught in the academy. It's more moves, but grouped into steps (the white cross, the corners, the second layer...) and each step links to its lesson.
Kubixel checks that the colors make a real cube and tells you what's wrong: missing stickers or too many of a color, a corner or edge that doesn't exist, or a twisted corner, a flipped edge or two swapped pieces. It's almost always a wrong color; check the marked pieces. If every color is right, someone has taken apart or twisted a piece of the real cube, and then it can't be solved with normal turns.
Yes, the solver is free and you don't need an account.
No. The scanner and the solver run in your own browser: the camera image never leaves your device.
For now the solver is for the 3x3. For big cubes there's the Swap tab, which works out algorithms to move pieces on cubes up to 7x7.
The shortest is usually 18 to 21 moves. The beginner method one is about 100-160, since it goes piece by piece.
They're the most similar colors. Scan in good light without glare; if one comes out wrong, you can fix it by painting before solving.