If you sign up for their Creative Cloud it’s $9.90 a month (or was I haven’t checked lately). It actually gives you a lot if you are a photographer making lots of photos. Besides opening up a few extra features it has cloud storage allowing syncing between everything and also opens up the use of...
LR is free. If you also subscribe to their Creative Cloud there is a monthly fee, however a subscription to their CC is not required to use LR and you’ll only lose access to a few features if you don’t do the monthly subscription