Your cycle is a signal. We're the first to read it properly.
Cycle Intelligence adjusts your HRV scores, sleep insights, and recovery guidance for every phase. We're building it now — be first in when it's ready.
Your cycle, understood
Four phases. Four different bodies. One platform that knows the difference.
Tap a segment to explore each phase.
Peak readiness.
Hormones at their most favourable. HRV is highest, sleep is best, stress resilience peaks. The body is primed — Fueld knows it.
Smarter scores
Your HRV score, finally telling the truth.
Most platforms give you a red alert when your late-luteal HRV dips. Fueld shows you the cycle-adjusted score alongside the raw score — because there's a difference between biology and a warning sign.
In the app
Cycle intelligence woven through everything.
Cycle awareness isn't a separate tab. It lives in every score, every chart, and every AI response — so you always have the full picture.
- Cycle context cardPhase, day, and predicted next phase — always at the top of your Health tab when you're cycle-aware.
- Phase-adjusted scoresEvery HRV, sleep and recovery score shows both the raw value and your cycle-adjusted reading.
- Cycle beat in your Health StoryYour weekly AI-generated health summary includes a Cycle beat — so context is always part of the picture.
- AI chat that understands your phaseAsk 'is my low HRV a problem?' and get an answer that accounts for where you are in your cycle — not a generic 'scale back' response.
Why do I feel like a completely different person every week?
Because you are. Your follicular phase brings rising oestrogen — sharper focus, faster recovery, higher energy. By late luteal, progesterone dominates, your core temperature rises 0.4°C, and your body is conserving resources. What feels like a mood is a measurable physiological shift.
Secure · Privacy-stripped · AI-powered
For professionals
Your female clients are carrying a signal your tools ignore.
With client consent, the Fueld portal surfaces cycle context alongside every other health pillar. Late-luteal fatigue, disrupted sleep, and lower training readiness are flagged in context — not as unexplained anomalies.
The evidence
Grounded in peer-reviewed research.
Fueld's cycle mechanic is built on published science — not wellness content. Every insight is educational and observational; it is a prior that your daily wearable data always overrides.
Wearable-derived HRV across the menstrual cycle — living systematic review
HRV is 3–9% lower in the luteal phase across wearable cohorts.
Read paperCardiovascular amplitude and menstrual regularity
New metric correlating HRV fluctuation magnitude with progesterone.
Read paperPMS, HRV, and attentional control across the cycle
Luteal HRV drop is more pronounced in high PMS-severity users.
Read paperSleep architecture across the menstrual cycle — EPISONO database
Mid-late follicular phase shows 89.9% sleep efficiency vs 83.7% in luteal.
Read paperFueld does not provide medical advice. Cycle context is educational and observational. Always consult a qualified health professional for clinical guidance.
Cycle Intelligence
We're building this for you.
Cycle Intelligence is in active development. Leave your email and we'll reach out with early access before public launch.