Below we specify which information is stored where and how it may be used. Details depend on the installation. Notably login may or may not be supported and logging may or may not be enabled.

User preferences
Preferences such as semantic highlighting or default profile, etc. are stored in your browser's local store and passed along to the server when applicable.
User profiles
If the user logs on a basic profile is established from data provided by the identity service provider (ISP, e.g., Google) and details added by the user. The given name and avatar URL are used in the chat service and associated with saved programs. The email is used for user-enabled notifications only. This profile may be deleted at any time using the Profile menu associated with the login avatar.
Stored files
Saved files are stored on the server along with the IP address, a time stamp and the information provided by the user in the Save dialog. If the file is marked public, it may be searched for, opened and edited by anyone, honouring user selected access restrictions. Saving a file after editing creates a new version. All versions are kept and never deleted.
If the user is logged in SWISH uses a session cookie to verify the login status.
HTTP logging
HTTP interaction is logged with full detail. This information is used to reproduce and fix stability issues. The data may be used for analysing the user interface and aspects of Prolog programming such as program evolution, debugging, etc. This information will not be made public. Server interaction includes: