Eyes, blinking, and screen habits
Interactive
Why screens dry your eyes
Drag a slider, watch a tear film thin: what 7 blinks a minute does to an eye built for 22.
ToolThe 30-second blink test
Measure your real blink rate with your webcam — entirely in your browser, nothing uploaded.
GuideThe 20-20-20 rule, explained
What the AOA-recommended break habit is, why screens make you blink less, and how to actually stick to it.
ComparisonBest eye-break apps for Mac (2026)
Slow Blink vs LookAway vs Blink Eye — timers vs real blink detection, honestly compared.
From the dev log
First up: an interactive simulator of what screen work does to your blink rate. More notes from building a cat that reminds you to blink — experiments, blink-detection engineering, our own blink stats — are on the way.
Meet the cat
Blink detection, 20-20-20 breaks, and on-device stats. Free for macOS.
Download Slow Blink