How often do you blink?

A 30-second test, entirely in your browser

Keep doing what you normally do at a screen — read this page, check something in another tab — and let the test count your blinks for 30 seconds. Behave normally; watching yourself like a hawk changes the result.

🔒 Runs 100% in your browser No video uploaded — ever Nothing stored

This was 30 seconds. Your workday is 8 hours.

Slow Blink watches gently all day and sends a cat when you forget to blink — 100% on-device, free for macOS.

Download Slow Blink Learn the 20-20-20 rule

Privacy: the camera image is analyzed frame-by-frame inside your browser using an on-device model. No video or image ever leaves your computer, and nothing is recorded — the same privacy principle as our macOS app. This test is not a medical device and provides no medical advice; if you have eye discomfort, consult an eye-care professional.