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Best skin temp data for cycle detection. Temp deviation detects ovulation earlier and more accurately than calendar math alone.

Body Battery, HRV Status, and stress score — useful for adjusting adaptogen and cortisol-support recommendations in follicular and luteal phases.

Resting heart rate trends and sleep stages from Fitbit or Pixel Watch via Google Health Connect.

Android health aggregator (Android 9+). Pulls period logs, steps, HR, and sleep from Flo, Natural Cycles, Samsung Health, and others in one OAuth connection.

Dietary fat, zinc, and B6 intake directly influence hormone synthesis. Linking MFP lets Selene cross-reference your macro intake with supplement recommendations — low dietary fat days increase omega-3 priority, low zinc days boost zinc recommendation.

Training load and recovery flags. High-intensity training in the luteal phase suppresses progesterone — Strava load data lets Selene increase magnesium and adaptogen support on heavy training days.

Micronutrient tracking at the ingredient level. Cronometer users can export detailed zinc, magnesium, vitamin D, iron, and B-vitamin data — the most specific dietary input for personalizing supplement dosing.

The most actionable sleep optimization data available. Eight Sleep's sleep score and stage data — combined with the bed's temperature settings — gives Selene the most accurate overnight recovery picture for luteal phase magnesium and melatonin dosing.

Recovery and strain scoring pairs directly with luteal-phase supplement adjustments. Strain data identifies when to up adaptogens.

Orthostatic HRV test (Polar H10) is the most accurate consumer HRV measurement — useful for confirming luteal sympathetic load.

Skin temp, HRV, and RHR in a ring without a subscription fee. Useful for users who want Oura-quality data at lower ongoing cost.

ScanWatch and Body Comp scale — SpO2, HRV, weight, and body composition. Useful for thyroid-profile users tracking weight variance across cycle.

Wrist-worn BBT sensor that reads through the night and retroactively corrects for wakeups. CSV export gives the most accurate basal temp record available without an Oura Ring.

FDA-cleared fertility awareness app. Exports BBT log + period history as CSV. If you already track in NC, this imports your full cycle history without re-entering anything.

If you track periods in Flo, Clue, or Natural Cycles on iPhone, those logs sync to Apple Health automatically. One export gives Selene your full period history, BBT, and HR — no app-by-app setup.

Samsung Health data via export. Works on Android — download your data from the Samsung Health app settings.

Continuous glucose monitoring reveals luteal insulin resistance — the most underappreciated PMS driver. Works with any CGM sensor via Levels.