Ecamm Live allows you to record without going live.
In the Destination menu in the bottom right-hand corner of the Ecamm Live main window, pick Record Only.
You may also wish to pick a recording resolution and shape. In the Options menu, pick from the Stream Size and Stream Aspect sub-menus. (These settings are also used for the recording size and shape.)
Recording in 1440p and 4K resolution is only available with an Ecamm Live Pro plan.