Sticky Previews is described as 'Lightweight productivity tool that lets you create live previews of any window or a screen region of your choice. It keeps previews above all other applications like a sticky-note thus allowing you to monitor any background window in real time no matter' and is an app. There are three alternatives to Sticky Previews for Windows and Mac. The best Sticky Previews alternative is OnTopReplica, which is both free and Open Source. Other great apps like Sticky Previews are WindowWatcher and Pocket Screen.
A lightweight application that provides a real-time thumbnail replica of any window of your choice. OnTopReplica will stay always on top, allowing you to keep track of the original window while working and without having to keep the keyboard focus on it.
WindowWatcher is a free hybrid window magnifier and remote control spy. It gives Windows the ability to have proper and resizable picture-in-picture support above and beyond Aero Snap. It's great for watching stuff like online TV, streams or Youtube playlists in a small...
Pocket Screen is a lightweight macOS menu bar utility that turns supported app windows into small, always-on-top picture-in-picture reference views.
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