
Research
How Offline Stroke Validation Works, Stroke by Stroke
Checking a handwritten character needs no cloud or neural net. Geometry, stroke order, direction, bounding box, centroid, does the job on-device and offline.
Lawrence Arya··6 min
Posts tagged Validation from the Hanzi Write Practice team.

Checking a handwritten character needs no cloud or neural net. Geometry, stroke order, direction, bounding box, centroid, does the job on-device and offline.

Can software grade your calligraphy against a master's style like Yan Zhenqing's? It can check correct form, but style conformity is a connoisseur's judgment.

Fluent native writing connects strokes the way running script does, and rigid apps flag that as an error. A good tool should grade stroke order and structure, not demand robotic separation.

Useful validation checks that you produced the character correctly from memory, stroke order and structure, not that you traced a nice shape. And it can do that on-device, offline.