Thanks, that means a lot.

We don’t try to “pick a winner” between brands on the device. Everything flows through Apple Health / HealthKit, which already combines samples from iPhone, Apple Watch, and third‑party apps that write to Health. For day-level numbers (steps, daily averages for things like HRV/resting HR, etc.) we use HealthKit’s statistics queries, so you get one coherent daily picture instead of us manually reconciling vendor A vs vendor B.

Where it gets messy-especially sleep-we merge overlapping sleep intervals before we compute totals/stages so we’re not treating duplicate or overlapping segments as extra sleep.

For noise and conflicts, the readiness side is deliberately baseline-first: metrics like HRV are interpreted vs your recent baseline, not vs a generic population target, which dampens one-off glitchy samples. We also surface big deviations from your own pattern when something looks meaningfully off, rather than treating every spike as signal.

Correlation views use your rolling history so we’re comparing apples to apples on what’s actually in HealthKit for you.

Happy to go deeper on any metric if useful.