How Pixactly works.

1. Read the target dimensions

A target width and height appear at the top of the canvas. Pause long enough to picture the shape: is it nearly square, clearly wide, or clearly tall? Thinking about proportion before absolute size gives your estimate a useful structure.

2. Draw the rectangle by eye

Draw once without a ruler, browser inspector, or measurement overlay. On a pointer device, drag across the canvas. On touch screens, use the precision controls. The goal is not a polished shape; it is an honest first estimate of width and height.

3. Compare the result

Pixactly overlays the target and your rectangle, then reports the target size, your estimate, width and height differences, size match, and elapsed time. A positive difference means you drew too large on that axis; a negative difference means you drew too small.

Read the two axes separately. A 20px total miss can come from width alone or from smaller errors in both directions. Those patterns call for different corrections. The scoring guide explains each value in detail.

4. Correct one bias at a time

Use the short interpretation after each round to choose one adjustment. If you repeatedly draw too wide, reduce only your horizontal estimate on the next comparable target. If height is the larger miss, anchor it to the width before drawing. Changing one variable makes the feedback easier to learn from.

A useful five-round routine

• Start with proportion: decide whether the shape is square, wide, or tall.
• Estimate the shorter edge first because it is easier to hold as a visual unit.
• Draw once and accept the result instead of correcting mid-drag.
• Note whether your larger error came from width or height.
• Repeat the set on the same display when comparing progress.

For more structured practice, continue with how to estimate pixels by eye or try the daily visual precision routine.

Frequently asked questions

Is Pixactly a scientific vision test?
No. It is a practice tool for visual size judgment, not a medical or scientific assessment.

Should I try to be fast?
Accuracy comes first. Time becomes useful only after your width and height errors become consistent.

Why do results feel different across screens?
Pixel density, viewing distance, and available canvas size change how a pixel feels physically. Compare progress on the same device when possible.

Does Pixactly replace measurement tools?
No. Production work still requires exact values. Pixactly trains the first visual estimate that happens before you inspect or measure.