Horizon adds a layer of intelligence to Apple Calendar. It automatically categorizes your events into 19 groups, Work, Health, Family, Travel, and more using on-device AI. Get daily briefings with weather and time breakdowns, find free time in one tap, track countdowns to events you’re excited about, and discover how you really spend your time with Life Patterns. No accounts, no cloud, no setup. Your data never leaves your device. Works with iCloud, Exchange, and CalDAV. $2.99, one-time.