the demo is 3 animals and up to 50 events (feeding shedding weight length ect.) it does alow you to have all your snakes breeding medical and other factors if there is ever a problem in a printable format i just purchased mine today. the trail is unlimited on time so if you only have 3 or less snakes its not a bad way to find out what is going on with your snakes and at least gives you a list of factors to include the data of when you have a problem other then just temp and humidity.