I do not collect any information about your calendars, the events on your calendars, or your class schedule. The only information I collect is anonymized basic usage information via Google Analytics.
All aspects of reading and exporting your class schedule happens inside your web browser, on your computer. This website does NOT read or store events from Google Calendar, and it only sends class schedules to your Google Calendar. Permission to read events from Google Calendar are not necessary for the site to function, but Google bundles them with the permission to add events.
For proof of the above, you are invited to visit the codebase at https://github.com/smhsu/webstacToCal.
This website uses Google Analytics, which sets a browser cookie to collect the following anonymized information:
I use this information to determine how many users visit (so I know if it is worth it to keep updating the site, haha), to understand how users are interacting with the site, and to give me an early warning if class parsing suddenly starts failing.