Draw a freehand oval on the canvas below. Our algorithm will measure how close it is to a mathematically perfect ellipse!
An oval (or ellipse) is one of the most fundamental shapes in art and geometry. Unlike a circle, an oval has two different radii — it's longer in one direction than the other. Here's how to improve your freehand oval:
Our algorithm evaluates your drawing on several mathematical criteria:
The test also verifies that your shape is actually an oval (not a circle) by checking the elongation ratio — your drawing should be noticeably longer than it is wide.
These three shapes are often confused, but they have important mathematical differences:
Our test specifically scores your drawing as an ellipse — symmetric and elongated. Try our other games to test different shapes!
A perfect ellipse is defined by the equation (x/a)² + (y/b)² = 1, where a is the semi-major axis (half the length) and b is the semi-minor axis (half the width). Every point on the ellipse satisfies this equation.
Fun fact: An ellipse has two focal points. The sum of distances from any point on the ellipse to both focal points is always constant. This property is used in architecture — the whispering gallery effect in elliptical rooms means a whisper at one focus can be heard clearly at the other!
Our scoring algorithm fits your drawn points to the best-matching ellipse using least-squares regression, then measures how far each of your points deviates from that ideal curve.
Studies have shown that people who regularly work with curves — architects, calligraphers, and industrial designers — tend to draw better freehand ovals. The skill improves with practice, and most people see significant improvement after just 10-15 attempts.
Average first-attempt scores by experience level: