We have tried to provide as fair a license structure as possible with no hidden charges or exclusions, but we also realize that it can make licensing seem confusing. 

This page explains which license type is best suited to your needs. 
 

FREE License
This is the normal Development license that everyone starts with. This license provides access to all features, and also for an unlimited number of websites, domains, applications and developers. It is the same as the Datacenter license and it works without restriction for Development usage. If a site becomes busy - goes into Production -  then it imposes a small delay on serving 'the next page'. This internal 'Rate Limit' can be removed by purchasing a Premium license.  Read more...

Single Website License
This Premium license provides access to all site building features and also removes all internal 'Rate Limits'. This is the license most often used by a business user hosting their own website or web application. It does not provide multiple site hosting or the billing and payment system for managing hosted sites. It is available either for outright purchase, or on a 'pay-as-you-go' monthly basis. Read more...

Datacenter - Unlimited Website License 
This premium license provides access to all site building features and also removes all internal 'Rate Limits'. It also provides multiple site hosting and a complete billing and payment system for managing hosted sites for SaaS or Cloud delivery. This license is used mainly by web-hosting companies providing clearString as a pure SaaS income stream, or by web development companies hosting their own customers' sites. It is available either for outright purchase, or on a 'pay-as-you-go' monthly basis. Read more...
 

Transitioning Licenses
In most cases you can 'upsize' a license simply by making a one-time payment to cover the difference between what you have paid so far, and the cost of the larger license. For example, you can upsize from a 'Single' to a 'Datacenter' simply by paying the difference in price. Or, a monthly pay-as-you-go License can be upsized to a full License at any time in the first 24 months simply by paying the balance difference.