Engineering2026-06-29·6 min
How ScreenCaptureKit makes on-device privacy possible
A look at the Apple technology under ScreenVeil — and why it means nothing leaves your Mac.
ScreenVeil is built on ScreenCaptureKit, Apple's modern framework for capturing screen content. It lets an app compose exactly which windows and displays appear in a capture — cleanly, and with the system's blessing.
No injection, no hacks
Because ScreenCaptureKit is a first-party API, ScreenVeil doesn't need code injection, private APIs, or kernel extensions to filter your feed. That's better for stability, better for security, and the reason it keeps working across macOS updates.
Why it stays on-device
All of this composition happens locally, frame by frame, on your Mac. There's no reason to send anything to a server — so ScreenVeil doesn't. No frames, no text, no titles ever leave your machine.