Does using Keyy cause any cookies to be set for my website visitors?

There are no cookies set for normal users however one is set for 60 seconds if/when you successfully login with Keyy to enable a (not yet existing) SSO feature. Details of the cookie:

Cookie name: keyy_just_logged_in.
Cookie contents: the Keyy cryptographic token that was used to login.
Cookie expiry: after 60 seconds.
Cookie sent to any third parties: No.