Yes, you are right. Once you stop paying for the Notezilla subscription, you lose access to the cloud but the basic program will still work on your computer.
For cloud subscription you would need to pay annually - This will allow you to keep all devices (any number of computers, iPhone, iPad, Android devices) in sync. And, if you choose Non-Cloud option, then it is just one time payment for Notezilla Window's version and you will have access to your program on your Windows desktop only.
For more details, please visit : www.conceptworld.com/Notezilla/Buynow