Mimsy, a small blue pixel cat

Mimsy

A tiny cat that dangles from your cursor and sways as you move — a little keychain charm for your Mac.

Download for macOS
Universal (Apple Silicon & Intel) · macOS 14+ · early beta · 232 KB

First launch

  1. Unzip the download and drag Mimsy into your Applications folder.
  2. Double-click Mimsy. Because it's an unsigned beta, macOS blocks it the first time — click Done.
  3. Open System Settings → Privacy & Security, scroll to the bottom, and click Open Anyway next to Mimsy. Confirm, and it launches.
  4. Mimsy appears hanging from your cursor. The M in your menu bar has show/hide, pause, settings, and quit.

Prefer the terminal? xattr -dr com.apple.quarantine /Applications/Mimsy.app lets it open with a plain double-click.

Private by design

No accounts, no network, no screenshots — nothing leaves your Mac. Mimsy just wants to hang out.