Account
Keep the results you already ran
The tools work without an account and always will. An account exists so a result survives closing the tab, and so the same site can be checked again later and compared against what it looked like before.
Checking whether accounts are open…
Create an account
Nothing is charged. There is no paid plan you can buy on this site yet.
You have a result waiting.The result you just ran is held in this tab. Whether it can be saved depends on the account's plan — saving is not part of the free plan, and paid plans are not purchasable on this site yet. You will be asked, and told either way, once you are signed in.
Accounts are not open yet
The account system is built but switched off. This is the honest state of it rather than a form that would accept your details and then fail. Every free tool on the site works right now without one.