Get Caret

One click from the Microsoft Edge Add-ons store. It installs in seconds and updates itself from then on.

Caret is with Microsoft for review and will appear in the Edge Add-ons store within a few days. This button goes live the moment it does.

In review — check back in a few days.

Chrome, Brave, Opera and Vivaldi install Edge add-ons too, so the same button works in all of them.

After it installs

Three things worth doing

Pin it

Click the puzzle-piece icon in the toolbar and pin Caret, so the on/off switch is one click away.
Reload the tabs you already had open

Extensions only attach to pages loaded after they are installed. Everything opened from now on is covered.
Start typing

Click into any text box and write. Mistakes underline about half a second after you stop; hover one for the fix.