You only pay once to use LoaPost on all your devices.
You use the same account for your laptop, your iPad, your iPhone, and your desktop. You use the same account at home and at work and on the road.
To get your Loa account, install LoaPost on your desktop or laptop by clicking the appropriate link on the left and letting our wizard step you through creating your account on that platform.
When you run LoaPost on any of your devices - desktop, laptop, iPad or iPhone - just sign in with the email address and password that you used to set up the account at first. You don't need a separate account.