FoQus is in closed alpha, and signing in is how we know which invitation is yours. We ask for an email address and nothing else — your breathing sessions stay on your own device either way. Once your place is approved, sign in with the same account to open FoQus: the access is attached to that account, not to this browser.
FoQus opens for people we have invited, and only while their place is current. We check that on every visit rather than trusting anything your browser is holding.