Subtraction Challenge (minus.onl.jp)
A math practice web app where you solve subtraction problems within a time limit. Great for improving children's arithmetic skills or as a brain workout for adults, with score recording.
Typing Speed Measurement (toolpods.io)
Measure your typing speed and accuracy. Track WPM (Words Per Minute) and error rate.
まんまるテスト
Free tool that measures how perfectly round your hand-drawn circle is. Scores based on roundness, closedness, and 360-degree coverage. Use as a stream mini-game or as an OBS Studio browser source.
