Is there a public iPadOS API (or entitlement) that lets a third-party app present a transparent, interactive drawing layer over another foreground app? What I want: App A (Safari, a video app, etc.) stays in the foreground and remains visible. My app draws Apple Pencil ink on a transparent layer above that content. Pencil strokes go to my layer. I do not need to read the pixels underneath. This must be possible with public APIs only, for an App Store app. What I already checked, and why it does not match: UIWindow / windowLevel: only orders windows inside my own scene, not above another app. Slide Over, Split View, Stage Manager: a separate window beside or over the other app, not a transparent ink layer on its pixels. Picture in Picture with a custom content source: a floating window, not a full-screen transparent canvas. ReplayKit / ScreenCaptureKit: capture or broadcast, not an interactive overlay. Screen Time shields / AssistiveTouch-style overlays: system UI, not available to third-party apps. I am not asking for a review of an app concept. I am asking whether any current public API can do this, and if not, which of the options above is the supported boundary. Environment: iPadOS 26, Xcode 26, PencilKit.

Public API for a transparent PencilKit layer above another foreground app?

Is there a public iPadOS API (or entitlement) that lets a third-party app present a transparent, interactive drawing layer over another foreground app?

What I want:

App A (Safari, a video app, etc.) stays in the foreground and remains visible.
My app draws Apple Pencil ink on a transparent layer above that content.
Pencil strokes go to my layer. I do not need to read the pixels underneath.
This must be possible with public APIs only, for an App Store app.

What I already checked, and why it does not match:

UIWindow / windowLevel: only orders windows inside my own scene, not above another app.
Slide Over, Split View, Stage Manager: a separate window beside or over the other app, not a transparent ink layer on its pixels.
Picture in Picture with a custom content source: a floating window, not a full-screen transparent canvas.
ReplayKit / ScreenCaptureKit: capture or broadcast, not an interactive overlay.
Screen Time shields / AssistiveTouch-style overlays: system UI, not available to third-party apps.

I am not asking for a review of an app concept. I am asking whether any current public API can do this, and if not, which of the options above is the supported boundary.

Environment: iPadOS 26, Xcode 26, PencilKit.