Ductus
Write the reference with a pen or mouse. Finger input pans nothing here; it is ignored on purpose, as the target app is stylus-first.

Use Score to compare movement: form, order, direction, pressure, rhythm.

Ductus

Calligraphy trainer: movement, not pixels. Offline PWA prototype.

Open ref Show pressure

What to practice

Reference JSON

Hand

Tool

Notes

Pressure calibration

Draw light, heavy, and slow curve samples. Save each sample after drawing it.

Pressure calibration not run yet.

10-minute Kurrent sessionNot started

Start with hairline → downstroke → compound curve → i → u → n → m → e → r → joins.

Each step keeps the normal guidance and scoring.

Score an attempt, then retry or continue.

Local history

No scored attempts saved yet.

Score a few attempts to see weakest glyph and dimension.

Draw a glyph, then score it.

Pointer data

Draw a stroke to see device data.

What the scores mean

Form checks path placement against the reference shape.
Order checks whether strokes were made in the reference sequence.
Direction checks whether each stroke travels the same way.
Pressure checks where the stroke gets heavier or lighter. Device pressure profile records raw and trimmed range so different pens/browsers can be compared without treating 0–1 as universal.
Rhythm checks whether the movement is steady or hesitant. Timing data says whether the sampling is usable, sparse, or noisy.

Device testing notes: manual checklist.

Author mode
In Author mode, your current strokes open a review step before they replace a teaching reference. Check order, direction, pressure, guide lines, and metadata before confirming.