• Background App Refresh: O₂ Buddy now appears under Settings → General → Background App Refresh, so iOS can wake the app for new readings while it's closed. A new onboarding step and a one-time reminder help you turn it on.
• Keep Readings Flowing guide: clearer steps for the Shortcuts automation, including the Apple Intelligence screen and what to search for.
• Settings shows a warning when Background App Refresh is off.
• Smaller widget extension.

• Made for iPhone Duo: unfold it and turn it sideways to see two columns side by side on Home, Trends, reading details and Settings. When it’s partly folded, the columns move apart so nothing sits in the crease.
• Unlocking O₂ Buddy Pro now takes you straight back to your readings instead of leaving the purchase screen open.
• Readings sync more reliably when your iPhone wakes O₂ Buddy while it’s locked.
• Updated “Keep Readings Flowing” steps for the new Shortcuts app in iOS 27.

NEW HOME
• Your latest reading, a Last Night summary, and today at a glance.
• Readings are now grouped as Typical, Lower, or Low.
SMARTER TRENDS
• Day vs Night now follows your sleep: if you track sleep in Health, "night" means asleep, and each night is counted on the morning it ends instead of being split at midnight.
• Insights: time in range, your pattern by hour of day, and your lowest readings.
• Heart rate and breathing rate around each reading, so you can see what was happening at the time.
SHARE WITH YOUR DOCTOR
• Export a PDF report or a spreadsheet of up to 90 days of readings.
APPLE WATCH
• A new paged Watch app: your latest reading, then a 7-day trend with daily ranges.
• Your last 100 readings on the wrist.
• Complications stay current and no longer go blank.
LOW READING NOTICES
• Readings that arrive together after you unlock your iPhone become one summary, with the time each was taken.
• Fresh low readings can now break through Focus modes.
FIXES
• Widgets update in the background again.
• Fewer duplicate syncs to the Watch.
O₂ BUDDY PRO
Trends, Watch history, vitals, insights, and export are part of Pro — a one-time purchase, not a subscription. If you bought O₂ Buddy before 2.0, everything you had stays free, and the new 2.0 additions are available at a reduced founder price. Thank you for supporting a one-person app.
Not a medical device. O₂ Buddy displays readings recorded by Apple Watch and is not intended to diagnose or treat any condition.

Version 1.5 is the biggest update yet - a whole new way to see your blood oxygen over time!

TRENDS ON THE MAIN SCREEN
The chart at the top has been rebuilt. Switch between 24 hours, 7 days, 30 days, and 90 days, and see each day's full range along with its average. O₂ Buddy remembers whichever range you used last.

NEW: DAY VS NIGHT
Tap the moon to compare your daytime readings against your overnight ones. If you wear your watch to sleep, try this one first.

RICHER READING DETAILS
Tap any reading to see where it fell that day, how it compares to readings taken around the same time on other days, and whether it's normal, below normal, or low.

NEW TREND WIDGET
A new Home Screen widget shows your 7-day trend at a glance, in small and medium sizes.

NEW WATCH COMPLICATIONS
• A color-coded gauge ring for circular slots
• A 7-day trend sparkline for rectangular slots
• Older readings now dim, so you always know when you're looking at stale data

FASTER, MORE RELIABLE SYNC
New readings reach your watch and complications faster, and complication updates now keep working reliably all day long.

A FRESH LOOK
Onboarding has been redesigned, and you can now set the app to Light, Dark, or Automatic in Settings.

Plus a tip jar for anyone who'd like to support development - entirely optional, and it unlocks nothing.

Thanks for using O₂ Buddy!

- You can now get low blood oxygen notification from the app.