Our Unique ID (UID) tracking cookie contains no actual "Personal Data" about visitors, but alas UIDs are considered Personal Data by the GDPR. This is the only Personal Data logged by default, but per Article 6 of the GDPR, this cookie does NOT require a visitor's direct consent as it is well within the "legitimate interests" of a web site using the service to know how many unique visitors they have, which is best accomplished with a UID. You must disclose this cookie in your privacy policy though (see Terms of Service changes below), or (not recommended)
fully disable tracking cookies.