Find your peak.
Catch the drift.
Trana turns your Apple Watch or WHOOP heart rate into your daily energy curve. Not sleep scores. Not generic rings. Your actual biology.
What Trana does
Calendars lie. Your biology doesn't.
Your peak,
every day.
Trana finds the 2-hour window when your cognition, alertness, and reaction time are measurably at their best — specific to you, from your actual heart rate data. Schedule your hardest meeting, your most important decision, your deepest work there.
Catch the shift
before the fog hits.
Circadian drift starts 2–3 days before the fog sets in. Trana catches it on day 2 and tells you in plain English what's happening — and the one specific thing to do today before it gets worse.
The app
Quiet, calm, glanceable
Your peak window, your rhythm status, one specific action — on your wrist and in your pocket. 30 seconds.
On track
trana
Score
Drifting later
Peak holding later than baseline
Drift Alert
93
trana
Graphic Circular
Complication
How it works
Wear your device.
No setup. No food logs. No mood journals. Your Apple Watch or WHOOP is already collecting heart rate data every few minutes. Trana reads it.
Trana learns your rhythm.
In 7 days, Trana fits a personal circadian model to your data. Your peak time. Your drift rate. Your baseline — not the population average. You.
Open the app. See today.
Your peak window for deep work. Your rhythm status. One specific action if something has shifted. That's it. 30 seconds.
Who it's for
Real patterns, real changes
What people see when their
rhythm comes into focus
Trana uses cosinor analysis — the standard method in chronobiology research since the 1960s, validated across 184,000 days of wearable data. It fits a 24-hour cosine curve to your heart rate and finds the peak. That peak is a biological signature of where your body clock is sitting today.
Peer-reviewed research shows cognitive performance varies 9–34% by time of day depending on the task. Scheduling at your personal peak — not the population average — is the difference between your best work and mediocre work from the same person on the same day.
After 7 days, Trana has your personal baseline. From day 8, every day gets compared to that — so when your clock shifts, Trana catches it within a day or two of it starting, 2–3 days before the fog sets in.
Bowman et al. (2021), Cell Reports Methods — 130,000 days of wearable data. Phillips et al. (2017) — Sleep Regularity Index. NSF Consensus Panel (2023) — sleep timing and health outcomes.
By the numbers
184k
days of wearable data
Validating cosinor as the standard chronobiology method for individual rhythm tracking
9–34%
performance variance
Cognitive shift by time of day, peer-reviewed
8–12%
mortality risk per +1yr
CosinorAge biological clock, 80K participants
2–3 days
earlier than you'd feel it
How far ahead Trana catches a circadian shift
Privacy
Your data stays
on your phone.
Raw HealthKit data never leaves your device. The only outbound traffic is anonymized rhythm summaries used to generate plain-English insights. No accounts. No cloud sync. No ads.
FAQ
Common questions
Trana is not a sleep app
It's the timing layer
for your life.
Seven days from now, you'll know your peak. And you'll know if it shifted while you weren't looking.
Apple Watch Series 4+ or WHOOP · iPhone iOS 18.6+ · Free to use