Yes, you can use your subscription on two Macs simultaneously. Just install Setapp on your second Mac and log in to your account.
To move your subscription from one Mac to another, do any of the following:
- Open Setapp's Menu on your Mac and sign out of the current account. Now, sign in on another computer; or
- Open your online Setapp account and view the 'My devices' section. Find a device you want to disconnect from Setapp and click 'Deactivate.' Log into Setapp on another Mac.