FitTrack — Hardening Checklist

1. Functional correctness

• HealthKit auth sheet shows only the data types we use
• Workouts logged in FitTrack appear in Apple Health within 5 s
• Watch workout sessions correctly record HR samples for the full duration
• Live Activity updates at the specified cadence; never older than 30 s
• CloudKit sync of new workouts works across two paired devices
• Complications refresh after a new workout is added

2. Security & privacy

• HealthKit read/write set is the minimum we actually need (no overreach)
• NSHealthShareUsageDescription and NSHealthUpdateUsageDescription are specific and honest
• No HealthKit data leaves the device (CloudKit private DB only; no third-party analytics)
• PrivacyInfo.xcprivacy declares Health & Fitness data type, Linked to user, Not used for tracking
• No force-unwraps in app, watch, or widget code
• No background fetch of HealthKit data outside an active workout (battery + privacy)
• All photo data attached to workouts is stored locally + CloudKit; not uploaded elsewhere
• Privacy Nutrition Label accurately reports health data collection

3. Performance

• Cold launch < 1.5 s on iPhone 13
• 30-day HR query < 800 ms
• No retained HealthKit observers after view dismissal (verify with Instruments → Allocations)
• SwiftData query for 1000 workouts < 200 ms
• Watch app cold launch < 2 s
• Watch battery cost of a 1-hour workout: < 8% drain (measure on physical Watch)
• Widget extension memory peak < 20 MB

4. Accessibility

• VoiceOver describes each chart data point on tap
• Dynamic Type up to accessibility5 doesn’t break the dashboard
• All actionable buttons have .accessibilityLabel
• Reduce Motion disables chart entrance animations
• Complications respect tinted face mode

5. Localization

• All strings via String(localized:)
• Distance: km vs mi based on locale
• Energy: kcal vs kJ based on locale (HealthKit gives joules; format respects user)
• Time format: 12h vs 24h based on locale
• Date pickers and chart axis labels respect locale

6. Apple Review

• HealthKit purpose strings explain why and what clearly (Apple Review checks these)
• Demo account credentials provided in App Review notes (if any login)
• App icon does NOT mimic Apple Health, Fitness, or Workouts
• No medical claims in marketing copy (Apple-prohibited)
• Privacy policy URL live and accurate

7. CI/CD

• Unit tests pass for HealthQueryStream (with mocked HKHealthStore)
• Snapshot tests for Swift Charts views
• Watch UI test for “start workout → end workout → save”
• Fastlane lanes for iOS app, watchOS app, and metadata
• Build numbers auto-incremented in CI

8. Documentation

• GitHub README has screenshots from iPhone + Watch + Live Activity
• Architecture diagram in repo
• ADRs reflect the shipped build
• Interview talking points rehearsed
• 60-second screen capture on portfolio

Sign-off

If every box is ticked, FitTrack ships. Move on to interview-talking-points.md.