While DeskPins is a popular free utility for keeping windows "Always on Top," it is exclusively available for Windows. There is no official DeskPins version for macOS.
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Apple Notes & Stickies: Both apps have a built-in "Float on Top" option. For Notes, double-click a note to open it in a new window, then go to Window > Keep on Top. While DeskPins is a popular free utility for
Sticky Notes: The Stickies app allows you to create notes and select Window > Float on Top to keep important information pinned over every other open window. For Notes, double-click a note to open it
Because macOS window management is limited, most modern Mac "power users" use dedicated window management apps that include a "Sticky" or "Always on Top" feature.