Are you in or are you out?
Yes, registration for this website is free. You can chose the basic / free option. Be aware that you will not get all the access. You do get that when you pay per year. If you choose to pay per month, it is always more expensive. About the access for a month: even then you don’t see all the options… You do see a lot more than the free plan. So the best option is to pay for a year!