Anki overlay lets you answer anki cards without having the Anki app focused. A card would just shows up on your screen, and while doing other things such as playing games or doing other work, you can also do your Anki passively when you have time.
There is a keyboard shortcut that enables the overlay and automatically puts Anki into Its "Review" mode for whichever deck you have selected. When you toggle it off, it automatically exits back to the deck list so it doesn't ruin your time per card stats.
All hotkeys are customizable in settings.
HOW TO USE:
After downloading, go to tools, overlay settings, and add the Anki decks that you are going to use with the addon. This addon was specifically made for Japanese, but would work with anything. If there is a field that you don't need such as pitch accent, simply leave it blank.
Note: This addon was only tested only on windows.