We have 3 plans –

Basic
https://trendspro.builtwith.com/checkout/basic
Gives you two technologies (i.e. All customers of Magento, all customers of Volusion) and any variation of those, i.e. Magento customers using premium AB Testing tools or Magento Customers that default to SSL or Volusion Customers using premium EV SSL certificates). You can also upload 2000 domains per month to get your own technology market share understanding of those lists.

Pro
https://trendspro.builtwith.com/checkout/pro
Gives you unlimited technologies, and 20,000 upload analysis credits rather than 2000 on Basic and is the best value as it’s less than twice the price of basic but with no report restrictions.

Enterprise
https://trendspro.builtwith.com/checkout/enterprise-yearly
Unlimited everything except API credits (1.2million)

$295 per month for Basic, $495 per month for Pro – both can be cancelled at any time and we’ll keep your account and reports on ice if you decide to come back and get fresh lists. Enterprise is $9950 per year with unlimited accounts. All data is exportable to CSV on all plans so you don’t have to worry about being locked into the interface and you can see what you can export here – https://kb.builtwith.com/export-reports/what-data-can-i-export-from-builtwith-pro/

Every month you can also “reset” your account, removing all of the reports allowing you to start fresh with new base technologies and keywords.

All upgrade able automatically via the links above and compared at http://builtwith.com/plans – there’s a demo of the upgrade process here – https://kb.builtwith.com/account-management/how-to-upgrade-your-account/ and a plan calculator here – https://builtwith.com/plans#calc