In short, this extension does not transfer, track or share any student, user or usage information.
The extension does leverage the Chrome 'sync' Services. In short, this means that if 'sync' is enabled, your class lists will be available on all devices where you are signed in. If sync is not enabled, class lists will function as previously with the LocalStorage functionality. All of the 'sync'ing between devices is completed using Google's standard API calls (over HTTPS). As before, your class lists are never saved to external servers.
The source code for this extension is provided to verify this policy - see Licence.
This Privacy Policy may be updated from time to time. When a change is needed, a prominent notice will be shown in the extension's Attendance dialog and this page will be updated. You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page.
Contact me at al[at]caughey[dot]ca if you have further questions.