You can use Krisp on one device at a time with a Free plan. If you log in to the same account on a second device, you will be logged out from Krisp on the first device.
With a Paid plan you can use the same Krisp account on two devices simultaneously.
Have a look at our Pricing page for up-to-date rates.
Hint
Note that if you're using one Krisp account on multiple devices and have your calendar connected to it, your calendar will be visible on all those devices when you sign in to your Krisp account. Check out more about the feature in this article.