Support

Analyzing the pixels under the loupe is the product, and the permission is how macOS allows an app to read the screen. ToneLoupe analyzes frames on the GPU and discards them immediately; nothing is recorded or transmitted. See the privacy policy.

System Settings → Privacy & Security → Screen & System Audio Recording → enable ToneLoupe, then relaunch the app. If the loupe ever shows a permission error, the panel has a button that takes you to the right settings pane.

You already can: the loupe's interior passes clicks through to the app below. Only the border band takes the mouse (outer edge resizes, inner edge moves). The two yellow chips in the top-right corner move the loupe and toggle the scopes panel, and Lock makes the whole loupe click-through.

In Skin mode: yellow = skin sits on the vectorscope skin-tone line; green or pink = hue drifting off it. In Exposure mode, luminance maps to a false-color scale with the skin target on the yellow band and clipping in red. The legend under the scopes shows the full scale.

macOS 14 (Sonoma) or later, Apple silicon and Intel. Performance cost is roughly 3% CPU at the default 15 fps.

Yes. The loupe and panel float above fullscreen apps and follow you across Spaces. The global shortcut (default ⌃⌥⌘S, changeable) hides everything to the menu bar and brings it back.