Gravitorium is shareware. You can try out Gravitorium free of charge for a period of 21 days, but after that we ask you to pay a small fee for its use in order to fund further improvements to the software.
Currently this fee is US$17 for personal use. A school or other educational institution may pay a fee based on the number of students using the software, currently set at US$5 per student, with a minimum of US$40. However, institutions with more than 100 students who wish to use the software are encouraged to contact us to negotiate site license fees.
You can purchase Gravitorium online through these means:
Purchase via PayPal:
Or
Purchase via ShareIt!
In either case, provide us with your preferred registration name and email address and we will send you back a registration key via email within two days.