Most Perfect Circle Drawn on a Screen

China

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Beihu-Chenzhou-Hunan, SAR, China / October 30, 2026

Yanhao Deng draws a circle freehand on a phone screen in Chenzhou, Hunan, China, and Luomashu's Circle Challenge page (画圆挑战) grades its roundness at 95.5 percent. The screen recording shows the touch marker tracing one continuous stroke that closes on its starting point, then the page's report: a fitted radius of 269 pixels with an average deviation of just 3.7 pixels. Earlier tries in the same recording score between 79.1 and 85.1 percent, which tells you how hard a 95.5 is.

Tags: most, online game, drawing, phone, circle, geometry

Rules

- Draw one circle freehand on a touchscreen in a single continuous stroke, without lifting the finger or stylus
- No coins, compasses, cups, stencils or other guides, and the screen stays still: turning the device under the finger is not allowed
- The circle must be scored by the Circle Challenge page (画圆挑战) at https://www.luomashu.com/circle-challenge, with the stroke closing back on its starting point; only that page's roundness score counts
- One continuous screen recording must show the stroke being drawn and the final score
- Must follow form of current world record holder
- Must provide video evidence
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