The best Shell Extension alternative to Classic Shell is StartIsBack. It's not free, so if you're looking for a free alternative, you could try Spencer. If that doesn't suit you, our users have ranked more than 25 alternatives to Classic Shell and four of them are Shell Extensions so hopefully you can find a suitable replacement. Other interesting Shell Extension alternatives to Classic Shell are WindowBlinds and IObit Start Menu 8.
StartIsBack returns Windows 8 a real fully featured start menu and start button, behaving exactly like the ones in Windows 7. StartIsBack radically improves desktop usability and makes new Start screen clutter-free.
Customize Windows 10 and 11 with skins for Start menu and taskbar. Includes SkinStudio for designing skins, offering personalized fonts, and color and transparency adjustments.
Start Menu 8 can help users who are not willing to change their behaviors and bring back the classic start menu. Users can enjoy a familiar start menu again with just one click while other styles are also available.
Bring back the Classic Windows XP Start Menu to Windows 8 & 10. With one click you have access to all of your Start Menu entries. Plus direct access to the Control Panel, Administrator command line and Run dialog.
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It has Windows 7 style, Windows 8 style, Windows 10 basic, and can turn the taskbar colors to glossy like Windows 7 and Vista had, also change the Windows start icon to the Windows 7 way or Windows 8 way.