StitchDiag

StitchDiag is a browser-based, photo-led troubleshooting assistant for ordinary home lockstitch sewing machines. Upload the front and back of one controlled test seam to receive up to three possible causes, visible evidence and counter-evidence, and one safe next check. It does not provide a confirmed diagnosis, repair guarantee, industrial-machine guidance, electrical repair, or internal mechanical instructions. The public diagnostic flow and safety guides are currently free.