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.
Typing Speed Measurement (toolpods.io)
Measure your typing speed and accuracy. Track WPM (Words Per Minute) and error rate.
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.
Streaming Roulette (www.ruri.info)
Free customizable roulette tool for live streamers. Design and generate a URL to use as a browser source in OBS Studio, adding a random-item-selection element to your stream.
Roulette (www.piliapp.com)
An online roulette wheel for random selection. Customize items on the wheel, spin it, and get a random result. Useful for decision-making, classroom activities, and games.
Roulette (toolpods.io)
Register items and randomly select one using a spinning roulette wheel. Useful for group assignments and prize draws.
Roll Dice (www.piliapp.com)
An online dice roller for random number generation. Roll one or multiple virtual dice with customizable sides for board games, tabletop RPGs, and classroom activities.
Reaction Time Test (toolpods.io)
Measure your reaction time in the browser. Respond to visual stimuli and see your results compared to animals.
Reaction Time Test (www.ruri.info)
Free reaction time measurement tool. Click when the screen turns green and measure your average response speed over 5 trials. Use as a mini-game in streams or as an OBS Studio browser source.
Rapid Tap Test (toolpods.io)
Measure how fast you can tap a button in a given time. Quantify your clicking speed in clicks per second.
Paint Web (paint.onl.jp)
A paint web app for drawing directly in the browser. Equipped with basic tools such as pen and eraser, it supports touch drawing on smartphones, tablets, and PCs.
Online Roulette (saruwakakun.com)
A free online roulette tool ready to use the moment you open it. Supports item customization, URL sharing, and fullscreen mode. Great for YouTube live streams or large-group events.
