Pace connects to your Apple Calendar via CalDAV for iPhone, iPad, and Mac scheduling
Pace connects to Apple Calendar using Apple's standard CalDAV protocol. Same read-only default and same privacy posture as the Google Calendar integration.
Pace uses Apple's official CalDAV protocol to read your iCloud calendars. Same calendars you see on iPhone, iPad, and Mac.
Pace can plan against your calendar without ever modifying it. Suggestions show up inside Pace, not as surprise blocks in your calendar app.
If you want the plan visible inside Apple Calendar, opt in and Pace writes planned sessions to a separate calendar you can toggle on/off.
If you use iCloud, connection takes 30 seconds with an app-specific password. If you run your own CalDAV server, that works too.