StressIT     StressIT comes in multiple editions. These editions can be broken down into three catagories: Lite StressIT Lite is our base line product and is available at no charge. This edition does not expire and can be used for as long as you like. However, there are a few limitations in this edition: Maximum number of virtual users is 5 The maximum test duration is 10 minutes The projects/reports created in the Lite edition cannot be used on a different machine IMPORTANT: Although there is no charge for this edition, you are required to obtain a license key from Synametrics, which activates the product. Click here to obtain a key.   Limited users The limited user edition includes everything that comes with the Lite version but allow you to create more virtual users. There is no limit on the time duration a test is run and a project/report can be reused on multiple machines. Click here to see how much does it cost.   Unlimited users As the name implies, the unlimited user edition does not have any restrictions on how many virtual users are created. Besides, Synametrics offers a Free OnSite traning session if you purchase this edition. Click here to see how much does it cost.