Motor biomarker · Research preview
Spiral Drawing Test
Draw or photograph an Archimedean spiral. Our HOG + SVM model (LOO-AUC 0.899, trained on 102 clinical drawings) analyses the shape for Parkinson's motor indicators. A photo of a pen drawing gives the most accurate result.
Provide a spiral drawing
Choose your input method. A photo of a hand-drawn spiral on paper is closest to the training data and gives the most reliable result.
📝 How to get the best result:
1. Draw an Archimedean spiral on plain white paper with a dark pen — start from the centre, spiral outward, 4–5 loops.
2. Take a photo in good lighting, flat on a desk, spiral filling most of the frame.
3. Upload the photo below.
1. Draw an Archimedean spiral on plain white paper with a dark pen — start from the centre, spiral outward, 4–5 loops.
2. Take a photo in good lighting, flat on a desk, spiral filling most of the frame.
3. Upload the photo below.
Click to upload or drag & drop
JPG · PNG · WebP · HEIC — any photo format
Trace the blue spiral guide from the centre outward. Note: mouse drawing is less accurate than a pen photo since the model was trained on clinical pen drawings.
🖊️ Click or tap to start drawing
Trace from centre outward
Trace from centre outward
Parkinson's Probability
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Healthy (0%)Threshold 50%Parkinson's (100%)
Research prototype only. Model trained on 102 clinical pen-on-paper
spiral drawings (LOO-AUC 0.899, Test AUC 0.889). Performance on browser canvas or
phone photos may vary due to domain differences from training data.
Not a medical diagnosis — consult a neurologist.