FitInsights

FitInsights turns the data your iPhone and Apple Watch already collect into a daily training and recovery coach with full transparency and detailed explanations.

Every calculation runs on your device, using your Apple Health data: workouts, heart rate, HRV, sleep, resting heart rate, steps, VO2 max, and body composition. No account, no upload, no ads (there is a small amount of user-provided inputs that get shared across the devices on your account via iCloud).

The Three Main Views (How It Works)

Dashboard: your daily decision
- Morning Capacity (0–100): overnight recovery minus what you've already spent
- Today's Load vs. your target band, with a rolling training "Base"
- Effort guidance: recovery, easy, moderate, or hard (matched to how you actually slept and recovered)
- Recovery chips for sleep, HRV, resting heart rate, sleep debt, and sleep regularity
- After-workout capacity, updated the moment you finish a session

Insights: the multi-week picture
- HR zone distribution and polarization, so you can see easy-vs-hard balance at a glance
- Load trend using short-term:long-term load ratio, shown as a trend
- HRV and resting heart rate against your own rolling baseline
- Sleep duration and regularity over time
- A wellness journal that sits alongside your objective data, without pretending the two always agree
- VO2 max and body composition trends, confidence-gated so noise doesn't masquerade as progress
- A metric library for anything else you want to chart and baseline from Apple Health data

Engine: is your fitness actually improving?
- Heart-rate recovery trend: how fast your heart rate drops after effort, a well-studied marker of aerobic fitness
- Aerobic efficiency trend: whether your heart rate is drifting less at the same pace over time
- A plain-language nudge on what (if anything) to add this week that always respects your current recovery
- An optional, opt-in monthly fitness check using a simple walk or run test; shown next to, never instead of, your Apple Watch VO2 max estimate

BUILT ON REAL SPORTS SCIENCE: training-impulse and acute:chronic workload methods, heart-rate-reserve zones, HRV baselining, and heart-rate-recovery research, instead of a black-box score.

PRIVATE BY DESIGN: reads from Apple Health, never writes anywhere else. No server, no login, and all calculations performed on-device.

FOR RUNNERS, CYCLISTS, AND EVERYDAY ATHLETES: built for recreational and endurance athletes who want to train smarter, not race-time prediction gimmicks or fake-precision scores.

FitInsights provides wellness and training guidance only. It is not a medical device and does not diagnose, treat, cure, or prevent any disease. Always consult a healthcare professional for medical concerns.

Requires an iPhone with Health app data. Apple Watch recommended but not required.

Privacy Policy - https://projectjth.com/multi-purpose
Apple EULA - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/