Your screen goes black.
Your session keeps running.
Curtain covers every display on your Mac with an opaque overlay that screen-capture tools cannot see. Walk away from the machine without handing the room a window into your work.
What it does
- Blacks out every display. A borderless overlay sits above the menu bar, the Dock and full-screen apps.
- Stays out of screen recordings. The overlay is excluded from the system capture pipeline, so Zoom, Teams, Meet, QuickTime and Screen Sharing all capture the desktop underneath instead of a black rectangle.
- Unlocks with Touch ID. One hotkey, then your fingerprint or password.
Why it exists
You are at home, working on your office Mac over Screen Sharing. Anyone walking past that machine can read your screen. Curtain blacks out the physical display while your remote session continues untouched.
Two editions
| Direct download | Mac App Store | |
|---|---|---|
| Black overlay on every display | Yes | Yes |
| Hidden from screen capture | Yes | Yes |
| Touch ID unlock | Yes | Yes |
| Blocks the local keyboard and mouse | Yes | No |
Blocking physical input needs a system-wide event tap, which Apple's App Sandbox does not permit. The App Store edition is therefore screen privacy only: the display goes black, but someone at the machine can still type. If you need the input block, use the direct download.
Permissions
| Permission | Why |
|---|---|
| Accessibility | Direct download only. Lets Curtain swallow local keyboard and mouse input while the curtain is up. |
| Touch ID or password | Confirms it is really you before the curtain lifts. Handled entirely by macOS. |
Curtain makes no network connections and collects nothing. See the privacy policy.