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Categorical distributions of the reviewed foot measurement apps (N=26).
| Subcategory | Count, n (%) |
| 3D Foot Scanner | 9 (35) |
| 2D Foot Scanner | 8 (31) |
| Shoe Recommender | 4 (15) |
| Simple Size-unit Converter | 2 (8) |
| Foot Progress Tracker | 2 (8) |
| Foot Tilt Calculator | 1 (4) |
