Privacy

Last updated November 10, 2026

Alterscreen runs entirely on your Mac. It has no account, no servers and no analytics. It doesn't collect, store or send any information about you or what's on your screen.

What Alterscreen does on your Mac

• It adds two virtual screens: one where the windows you put on Alterscreen live, and one you share in your calls.
• It draws the shared screen from the windows of the apps you've allowed, live, in your Mac's memory. Nothing is recorded or saved.
• It remembers your settings (the apps you've allowed, Alterscreen's size and background) in your Mac's preferences, and writes a log of what it did to ~/Library/Logs/Alterscreen.log, so problems can be looked into. Both stay on your Mac.

Permissions

• Screen Recording, so Alterscreen can draw its screen from the windows on it.
• Accessibility, so it can move windows onto Alterscreen and back to where they were.

You can turn either off at any time in System Settings › Privacy & Security.

Sharing

Your call app (Zoom, Google Meet, Microsoft Teams and so on) does the sharing, under its own privacy policy. Alterscreen doesn't connect to your calls or to the internet.

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