PiP

PiP is a macOS utility that creates always‑on‑top previews of any visible window. It captures window contents with a CoreGraphics‑based capturer and renders them using OpenGL or Metal, supporting HiDPI displays. The app can clone multiple windows, display camera input, and handle HLS streams, while offering cropping, aspect‑ratio‑preserving resizing, and opacity control via a right‑click menu. Users can open a new preview with ⌘ N and close it with ⌘ W, and toggle native picture‑in‑picture mode with ⌘ P.

In addition to local window cloning, PiP integrates an AirPlay backend, allowing up to ten simultaneous AirPlay sessions for streaming the preview to external displays or devices. The AirPlay sender is marked as unstable, and the feature requires disabling the built‑in AirPlay receiver on macOS 12 or newer. The application is a nibless Cocoa app with a minimal modern UI and relies on private frameworks for native picture‑in‑picture support, without any third‑party dependencies.

The project is distributed as a stable macOS binary, available via direct download or Homebrew cask, and can also be built from source using Xcode. It targets users who need persistent, resizable window previews for multitasking, monitoring, or presenting content while working on other tasks.