Drop a disc by clicking a column. The glowing arrow marks the engine's best move for the side to play.
Red to moveReady
🔴 RedBlack ⚫
0.9s
Scan board from a photo
Take or choose a photo of your Connect 4 board, shot as straight-on as possible so the discs aren't too distorted.
Drag the four dots to the centres of the four corner slots. The right-hand panel shows how each disc is classified in real time — tune it with the sliders, or use the calibration below.
Live classification
Colour calibration — recommended
Pick a colour below, then tap matching slots on the photo. Tap a few empty holes too — they're see-through, so their colour varies.
Tap any cell to fix a misread (empty → red → black). Stacks are auto-settled to the bottom when applied.