StitchDiag

StitchDiag helps home lockstitch sewing machine users turn photos of a controlled test seam and a short questionnaire into possible causes, supporting evidence, one reversible next check, and clear stop conditions. It covers skipped stitches, thread loops, bird nesting, thread breakage, puckering, and fabric-feed problems. Free public guides explain one-variable-at-a-time testing and when to seek professional service. It does not provide a certain diagnosis, promise a repair, or replace a qualified technician. It does not guide industrial, overlock, embroidery, electrical, internal timing, or opened-machine repairs. Stop for smoke, heat, electrical smells, repeated metal strikes, or hard jams. Free public diagnosis and guides are currently available; paid checkout is not publicly offered.