You have the choice how to use our add-in, depending on your individual requirements. The COM add-in supports some features which are not supported with the Office add-in. If you do not need the features being available with the COM add-in, we strongly recommend using the Office add-in, since it’s much more lightweight. If you need the features of the COM add-in, you basically can decide if: You only want to use the COM add-in (only works on Windows) You want to use both - COM add-in on Windows and Office add-in on iOS/Android/Web If you want to use both, we recommend hiding the Office add-in in Windows, so you do not end up with too many buttons. You can check the differences here.