Burnout doesn't announce itself

But your data does — days before you feel it.

A declining HRV, a rising resting heart rate, and eroding sleep together are the signature of accumulating recovery debt. Sage + Stone watches your personal baseline across every device and surfaces the drift early — so you can back off before you crash, not after. Informational only, not a diagnosis.

Get Sage + Stone free

Recovery across every device

HRV, resting heart rate, sleep and training load from all your wearables in one recovery picture — not four conflicting scores.

Early-warning on drift

When your baseline slides — HRV down, resting HR up — Sage + Stone flags it days early, while a rest day still fixes it. Informational, not a diagnosis.

AI coach for recovery

One plain-language read each morning on whether to push or rest — based on your real recovery trend, not a generic readiness score.

Stress & sleep, unified

See how stress load and sleep quality feed your recovery over weeks — and what actually moves the needle for you.

Feature · Pattern Deviation

It learns your normal — not a population average.

Most wearables flag you against a one-size-fits-all threshold, so an athlete with naturally low HRV gets pinged constantly. Stone, your AI recovery coach, instead learns your own 14-day rolling baseline for HRV, resting heart rate and skin temperature — and only surfaces a Pattern Deviation when 2 or more signals drift from your normal at once. Far fewer false alarms, and the drift it does surface is worth paying attention to.

✓Your 14-day rolling baseline. HRV, resting HR and skin-temp each get their own personal normal that updates as you do.
✓Two-signal rule. A single noisy night won't trip it — a Pattern Deviation needs 2+ signals moving together, which is what real recovery debt looks like.
✓Observational, never diagnostic. Stone describes your personal trend in plain language and suggests rest. It never names a condition — bring anything that concerns you to your provider.

Pattern Deviation 2 of 3 signals drifting

−19%

HRV

+0.6°

Skin temp

Rest HR

Stone · your AI recovery coach

Your HRV is 19% below your typical baseline and your temp is up — this two-signal pattern is worth resting on. Illustrative. Observational read of your own trend — not a diagnosis.

Feature · Cycle Readiness

A luteal HRV dip is expected — so we stop flagging it.

If you log cycle data, your recovery score becomes Cycle Readiness. The natural HRV trough in your late-luteal phase is treated as normal context rather than a red flag, so Stone doesn't alarm you for something your body does every month. This is cycle context for recovery — not a hormonal diagnosis, and never a fertility or contraception prediction.

Cycle Readiness Cycle day 22 · late luteal

HRV vs your baseline−12%

Expected luteal rangenormal

74Cycle Readiness · normal for late luteal

Stone · your AI recovery coach

HRV 12% under baseline but expected for cycle day 22 — adjusted Cycle Readiness 74, normal for late luteal. Illustrative. Cycle context comes from data you enter or from Apple Health — never inferred from symptoms.

✓Phase-aware, not phase-guessing. Cycle phase is read only from cycle data you log or sync from Apple Health — Stone never infers your phase from how you feel.
✓Expected dips stay quiet. The late-luteal HRV trough is folded into your normal range, so your readiness score reflects context instead of a false alarm.
✓Context for recovery only. This supports how you train and rest. It is not hormonal diagnosis, fertile-window prediction, or contraception guidance — bring health questions to your provider.

Cycle Readiness appears only when cycle data is present · informational, not a medical device

Available on iOS

Stay ahead of the crash. Free to start.

Connect your devices, see your unified recovery timeline and your first AI insight free. Upgrade to Pro for recovery coaching + early-warning alerts.

Download for iPhone All features

Sage + Stone surfaces insights; it doesn't provide medical advice. Talk to your doctor.