For clinicians
Her nights, charted for the appointment.
A patient who wears an Apple Watch is already recording her nights — and with iOS 27, expected this fall, her iPhone will be able to tell her, at 40 or older, that her logged cycles look consistent with perimenopause. Perigee turns those Watch readings into a short, chart-first summary — each night against her own usual range, with her symptom log and HRT log on the same timeline — dated and ready to hand over, so the conversation has a record to start from.
What the patient hands you
The Health Summary is a short US-Letter document, generated on her iPhone from Apple Health. Page one charts her nights — wrist temperature and HRV against her own usual range, sleep night by night — with her symptom log and HRT log aligned on the same timeline; the numbers and a how-to-read key follow. She picks the window — 4, 8, or 12 weeks — and shares it as a PDF or on paper. The page shown is the actual first page — rendered by the app itself from demonstration data, watermarked Sample — not a mockup.
- Watch readings
- Night-by-night charts: heart-rate variability, wrist temperature (as a deviation from her own baseline) and breathing rate are each drawn against her own usual range; sleep duration is charted night by night without one — deliberately, since sleep has no personal reference range in Perigee. Nights the Watch missed stay gaps, and averages sit beside the charts. Resting heart rate is charted and listed separately — a daytime estimate Apple computes from waking rest, not sleep.
- Symptoms logged
- What she chose to log, how often, and average intensity on a 1–3 scale (mild / moderate / strong), over the same window.
- HRT log
- Dated hormone-therapy entries, as she recorded them. Perigee never suggests starting, stopping, or changing anything.
“This is a wellness summary, not a diagnosis. It compares Apple Watch readings with what’s usual for you and is meant to support a conversation with your doctor. It does not detect, diagnose or stage a condition, and it never recommends medication changes.”
What Perigee deliberately doesn’t do
No diagnosis, no staging
Perigee never tells a patient she is in perimenopause. Whether the transition has started is a clinical question, and the app says so.
Her baseline, not a cohort
Each reading is compared with what has been usual for her in recent weeks. Nothing is scored against a population norm or reduced to a readiness score.
No detection claims
Perigee doesn’t use Watch readings to detect or test for anything — not hot flashes, not perimenopause. They appear as dated trends with the nights of data behind them; the science page lists the relevant studies and their limits.
Computed on the phone
Readings are worked out on the patient’s iPhone, and the Health Summary is rendered there too — its header states that nothing is uploaded. Raw Apple Health records never leave the device.
The science page lists the published research behind the app’s explanations, with each study’s limits stated.
Apple’s notification is about to walk in
Apple has previewed perimenopause support for iOS 27: the Health app will be able to read about six months of logged cycle history and, for users 40 and older, surface a notification when the patterns look consistent with perimenopause. It draws on logged cycles, not Watch sensors — a statistical flag, not a finding. Some of those notifications will come to your clinic with questions attached — and some will reflect incomplete logging, stress, thyroid conditions, or medication rather than the transition.
A one-page brief, written to be printed
What the notification is based on, what it can’t say, and what an Apple Watch does and doesn’t record overnight. No sign-up — it’s a PDF.
For patients, there’s a plain-language version: Apple’s perimenopause notification, explained.
Putting it in a patient’s hands
Perigee runs on iPhone with any Apple Watch that tracks sleep; wrist temperature needs a model with temperature sensing — Series 8 or later, SE 3, or any Ultra. The symptom and HRT log are free, along with three morning summaries a month. The Health Summary PDF is part of Perigee Plus ($6.99/month or $49.99/year in the U.S. storefront).
Perigee is built by a small independent team — email hello@perigee-app.com and the founder answers. If you’d like to evaluate the app firsthand, we’ll send a complimentary access code for your own evaluation.
Your watch records the night. Read it back.
Free to download · Plus price and any eligible introductory offer appear in Apple’s purchase sheet