The best alternatives to Hidden Bar are Bartender, Hocus Focus, and Dozer. If these 3 options don't work for you, we've listed a few more alternatives below.
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Bartender lets you organize your menu bar icons, by hiding them, rearranging them, show hidden items with a click or keyboard shortcut and have icons show when they update.
Dozer is a Free and Open Source Alternative to Bartender App for Mac. Almost every top/must have/best Mac apps list in existence for the past couple of years is recommending Bartender – a simple app that hides away menu bar icons until you need them and so both saves space and stops distractions.