I think the algorithm just compares the distance between the center and your first point to the distance between the center and each subsequent point. So, for example, drawing an imperfect but centered circle will get you more points than drawing a perfect circle that's really off center.
Fun toy!
Who cares about the best circles
The lowest i managed to reach was 19.3%
Rookie Number
Update:
I think the algorithm still needs to be improved a bit.
You're such an inspiration
GG ez
It didn’t take long but they have fixed that now. You can’t do a dot as you have to draw a circle around the dot they have.
No issues yet lol
Hmm...
I have questions.
How low can you go?
It does seem harder to reach lower numbers than high numbers
Just have to make spiral or something like this.
Update:
Best I got
Edit: 
😏
Gotta get that "Legendary" status
Can't even get 100% using a drawing tablet and a protractor.
My immediate reaction before opening the link: "No."
Yet I somehow got 96.6% twice.
Visually, I certainly wouldn't call them 3.4% away from perfect. I'm guessing there's some allowance for imperfection even at 100%.
Too many sweats
96.8% is my best.
~~92.3%~~
96.8!!
My circle is 91.3% perfect, can you beat that? https://neal.fun/perfect-circle/
My circle is 94.1% perfect, can you beat that? https://neal.fun/perfect-circle/
My circle is 96.0% perfect, can you beat that? https://neal.fun/perfect-circle/
My circle is 96.1% perfect, can you beat that? https://neal.fun/perfect-circle/
Somebody stop me!!!!!!
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