We provide significant discounts if you purchase large number of tests in a single order.

However, you may not want to purchase large numbers of licenses in one go if you are unsure exactly how many licenses you should allocate to each computer.

Purchasing credits lets you lock in the discounts by making a bulk purchase, but only use the credits you need to purchase licenses for specific computers when you need them. This allows you more flexibility to get the licenses where you need them, so you won't end up running out on some computers while you still have many left on others.