I found EyeTestOnline.org, a free, browser-based site that lets you take a quick, scientifically grounded vision screening online. It includes visual acuity, color vision, contrast sensitivity, and visual field tests that can be completed in just a few minutes and works on any device with instant results. The platform processes everything locally — no registration needed, no personal data collected, and results stay on your device. There’s a clear medical disclaimer that these tests are screening tools only and not a replacement for a professional eye exam, which is especially important if you’re noticing vision issues or have medical concerns