There are 3 licenses: free, 3 month and one year. The free one is without costs and include all functions (with web server access). If you buy a license you do not have to confirm the free version when sending a in/out booking. All buy licenses includes 30 test days. Nevertheless if using many time this app, please buy the license. This is the only way to pay the programmer.
The system can be used by one person or by a company. A company can manage a few of people and devices.
The App is free. With Web registration you can use the Web-GUI (evaluations, etc) for a test time of 3 month. With a unique payment you can extend the Web-Usage for a year. If you do decide not to extend (or do nothing), the web access will locked and the App can only used with local data. All Web-booking data will be deleted in one year.