Horizon
GitHub repo

Give your eyes a rest from long screen time.

Horizon is a macOS menu-bar app built on the 20-20-20 rule doctors recommend: every 20 minutes it rests your eyes for 20 seconds, so they can ease off and refocus. Then it hands your screen right back.

Download for macOS Free · macOS 12 and later
The break screen This is what your Mac shows: a calm scene and a 20-second countdown.
Look ~20 feet away
Rest your eyes. Focus on something in the distance.
0:20
The control panel Lives in your menu bar, with a live countdown. Break now, pause, or tune the timing.

First time opening Horizon

macOS adds one extra step the first time you open an app from outside the App Store. You only do this once.

  1. Open the downloaded Horizon.dmg, then drag the Horizon icon onto the Applications folder.
  2. Open your Applications folder and double-click Horizon. macOS will say it “could not verify” the app — click Done.
  3. Open the Apple menu → System Settings → Privacy & Security.
  4. Scroll down to the Security section. You’ll see that “Horizon was blocked” — click Open Anyway.
  5. Confirm with Touch ID or your password, then click Open Anyway once more.

That’s it — Horizon now lives in your menu bar (look for the eye icon), and you won’t see this prompt again.

Prefer Terminal?

Run this to clear the quarantine flag and skip the prompts:

xattr -dr com.apple.quarantine /Applications/Horizon.app