Great question! We think you'll like the answer :-)
Revizzit apps are now and will always be free to download. The only thing your customers pay is the price you set for your product.
In addition, your customers can install up to six apps on their devices, so they can enjoy your products from everywhere.
Finally, your customers will always have access to the products they purchased, which are safely stored in the cloud. That means even if their computer dies, or they buy a new one, they can just install the Revizzit app, login and retrieve everything again!
By the way, this is true even if you decide to discontinue using Revizzit. All of your customers will still have full access to everything they paid for!