Drop or paste a screenshot of a board. The piece set and orientation are detected automatically - grab more sets from the Piece sets tab to cover every Lichess theme without calibrating anything.
A recognised screenshot lands here automatically - drag pieces to explore, or to fix a misread square. The engine re-evaluates continuously as the search deepens.
Share the window you are playing in and mark the board once, or paste a fresh screenshot after each move. A position joins the game only when a single legal move explains it, so misreads and half-drawn animation frames are discarded instead of corrupting the record.
About 1 MB in total, fetched from lichess.org's public repository for personal use. Screenshots using any downloaded set are then recognised automatically, with nothing to calibrate.
For art the app does not know - Chess.com themes, custom pieces - upload or paste a screenshot of that site's standard starting position . The result joins auto-detection as the "custom" set.