VO2 Max Daily Tracker

A local-first iPhone and Apple Watch dashboard for Apple Health cardio fitness estimates.

Features

• Latest VO2 max estimate with a configurable target range
• 30-day and 90-day trend analysis
• One-year chart history with target-range band and period stats
• Clear guidance when Apple Health has not recorded a value yet
• iPhone widgets and Apple Watch complications (with sparkline)
• Local SwiftData cache shared with widgets

VO2+ (premium)

Subscription/lifetime unlock through RevenueCat (any active entitlement unlocks). The four pillars:

• What Moved It: pairs each stretch between estimates with the cardio workouts recorded inside it, then compares rising stretches with flat ones
• Heart Signals: resting heart rate and 1-minute heart rate recovery, the signals that keep moving while VO2 max is quiet
• Estimate Freshness: whether an estimate is overdue against the user's own median cadence, what qualifies as a refresh, and an opt-in nudge when it goes stale (rate-limited to one every five days)
• Monthly recap, reading alerts, and the shareable PDF report

Supporting depth (unchanged): Deep Trends period comparisons, target outlook, typical-range context, personal best.

Free users see a locked teaser card and locked Settings toggles that open a focused paywall. Trial copy only appears when StoreKit intro eligibility is confirmed (Apple 3.1.2).

VO2 max values are Apple Health estimates, not medical measurements. The app is for fitness awareness and does not diagnose, treat, or predict health conditions.

Build

xcodegen generate
UDID=$(agent-sim boot vo2max)
xcodebuild -project VO2Max.xcodeproj -scheme VO2Max -destination "id=$UDID" build
xcodebuild test -project VO2Max.xcodeproj -scheme VO2Max -destination "id=$UDID"

For a populated simulator UI, add -DemoData to the scheme launch arguments.

RevenueCat

Set RevenueCatConfig.publicSDKKey to the app-specific public key beginning with appl_. Never place a RevenueCat secret key beginning with sk_ in the app or repository. The simulator intentionally skips RevenueCat configuration and uses the local Pro override in Settings.