You can use a single Notezilla license on 2 Windows computers. This is if you purchase the Non-Cloud version. The Non-Cloud version doesn't automatically sync notes between computers and also doesn't give you access to your notes from your smartphone. The Non-Cloud version is one time payment.
We do have Notezilla - Cloud version
With cloud subscription, you can install Notezilla (Windows version) on any number of devices as long as all are syncing using the same cloud account, plus all are used by same user.
Note: Automatic sync across devices happens every minute.
For phone & tablet apps we are charging $4.99 (as of now) which is refundable if you pay for cloud subscription.
Once you purchase cloud subscription & phone app, just let us know. We will refund back $4.99.