I highly recommend Color Blindness Test. It's a fantastic tool for anyone wanting to check their color vision. The test is based on Ishihara's standards, ensuring accurate detection of color vision abnormalities like red-green color blindness. The multilingual interface (Chinese, English, Japanese) is a great touch, and the fact that it's free and protects user privacy is a big plus. Check it out at https://color-blindness-test.com!