We have 2 different pricing model, Notezilla (Cloud) and Notezilla (Non-Cloud). The non-cloud version is one time payment. So you don't have to pay again every year for the same version of Notezilla .
However, if you are planning to sync between your PCs and devices(Android, iPhone, iPad), then the pricing is on annual subscription basis. With the cloud subscription, you can install Notezilla on any number of devices as long as they are all synced with the same sync account and used by a single user.
More details over here: http://www.conceptworld.com/Notezilla/BuyNow
We will surely refund if you are not satisfied with Notezilla . However, Notezilla is available as a trial version (fully functional). You can download and try it for 30 days for free. If you like it, you may purchase it.
You can download from http://www.conceptworld.com/Notezilla/Download