O2 Buddy: Blood Oxygen SpO2

O₂ Buddy makes your blood oxygen readings effortless to see, understand, and track - on your iPhone, your Home Screen, and your wrist.

Your Apple Watch already measures your blood oxygen throughout the day and night. O₂ Buddy turns those readings into something you can actually use.

SEE YOUR TRENDS
• Switch between 24 hours, 7 days, 30 days, and 90 days with a tap
• Every day shows its full range alongside its average, so you see the whole picture - not just the last number
• Watch your average rise or fall compared to the period before

DAY VS NIGHT
• Compare your daytime readings against your overnight ones, side by side
• Wear your watch to sleep and see how your oxygen behaves while you rest

EVERY READING IN CONTEXT
• Tap any reading to see where it falls within that day
• Compare it against readings taken around the same time on other days
• Know instantly whether it's normal, below normal, or low

ON YOUR WRIST
• A fast, glanceable Apple Watch app with your recent readings and 7-day trend
• Complications in circular, rectangular, corner, and inline styles - including a color-coded gauge ring and a 7-day trend sparkline
• Readings sync from your iPhone as soon as they're recorded

ON YOUR HOME SCREEN
• A widget for your latest reading
• A widget for your 7-day trend

LOW OXYGEN ALERTS
• Optional notifications when a reading falls below a threshold you choose

PRIVATE BY DESIGN
• Read-only access to Apple Health
• Your data stays on your devices - never uploaded, never shared, never sold

Also includes Light, Dark, and Automatic appearance, 12- or 24-hour time, and built-in FAQs and support.

O₂ Buddy is not a medical device and is not intended to diagnose or treat any condition. Blood oxygen measurements are recorded by Apple Watch and stored in the Health app.