You can use Info Angel absolutely free of charge for 30 days. After this period is over, you must either register the program or stop using it.
Registered users can use all features of the program without limitations. Besides, such users get a free support for the entire period of working the program.
All minor updates within a major version (for instance, 3.0, 3.1, 3.2, etc.) are free for registered users. When a new major version with considerable interface and functionality improvements is released (for instance, 4.0), you will get a 50% discount for it.
Registration steps are described in detail on the "How to register" page.