Real-time circadian biology

Your body clock,
running right now

Enter three numbers. See your cognitive power, hormone levels, and optimal performance windows update in real time — grounded in peer-reviewed science.

Find Your Chronotype Open Dashboard

Configure Your Body Clock

Three inputs are all it takes. Your data stays in your browser — nothing is sent to any server.

What powers this dashboard

Every metric is derived from established chronobiology models, not guesswork. The calculations run entirely in your browser.

Cortisol Awakening Response
Pruessner et al. (1997) — Life Sciences
Two-Process Sleep Model
Dijk & Czeisler (1995) — Journal of Neuroscience
Post-Lunch Dip in Performance
Monk et al. (1992) — Chronobiology International
View all 10 research sources below
24
hours tracked in real time
4
chronotype categories
10+
peer-reviewed studies cited
0
data sent to any server
What PeakBio does

Five tools, one biological system

Most productivity tools ignore your biology. PeakBio starts with it.

01
Live Body Dashboard
Watch your cognitive power, physical strength, creativity index, and sleep pressure update second by second, calculated from your personal schedule and chronotype.
02
Chronotype Discovery
A research-validated 25-question assessment that identifies whether you are a Lion, Bear, Wolf, or Dolphin — and exactly what that means for your daily performance curve.
03
Personal Schedule Engine
Generates a science-grounded daily schedule — coffee windows, deep work blocks, exercise timing, meal cutoffs, and sleep — calibrated to your chronotype.
04
City Sync Score
Enter any city in the world. PeakBio uses AI to retrieve local lifestyle data and scores how well that city's rhythm aligns with your biological type.
05
Specialist Tools
Standalone calculators for coffee timing, exercise windows, sleep cycles, study blocks, power naps, and supplement timing — each explained with the underlying science.
06
Zero Data Collection
Every calculation runs in your browser using JavaScript. Your wake time, chronotype, and schedule never leave your device. No account required.
Research foundation

Built on a decade of chronobiology research

The biological models in PeakBio are approximations based on the following peer-reviewed studies. We do not claim clinical accuracy — this is an educational tool informed by science.

Chronobiology — the study of biological rhythms — has been a serious scientific field since the 1970s. The discovery of the suprachiasmatic nucleus (SCN) as the body's primary circadian pacemaker, the characterization of individual chronotypes, and the mapping of the two-process model of sleep-wake regulation have fundamentally changed how we think about productivity, health, and performance.

The calculations in PeakBio draw from this body of work. The cortisol model uses the Cortisol Awakening Response (CAR) curve described by Pruessner et al. The sleep pressure metric follows the homeostatic component of Borbely's two-process model. Cognitive performance curves are based on the chronotype-dependent oscillations described by Roenneberg and colleagues at Ludwig Maximilian University.

Circadian Rhythm Guide
Roenneberg, T. et al. (2007). Epidemiology of the human circadian clock. Sleep Medicine Reviews, 11(6), 429–438. [Chronotype distribution in the general population]
Czeisler, C.A. et al. (1999). Stability, precision, and near-24-hour period of the human circadian pacemaker. Science, 284(5423), 2177–2181. [Intrinsic period of the human clock]
Pruessner, J.C. et al. (1997). Free cortisol levels after awakening: a reliable biological marker for the assessment of adrenocortical activity. Life Sciences, 61(26), 2539–2549. [Cortisol Awakening Response model]
Dijk, D.J. & Czeisler, C.A. (1995). Contribution of the circadian pacemaker and the sleep homeostat to sleep propensity, sleep structure, electroencephalographic slow waves, and sleep spindle activity in humans. Journal of Neuroscience, 15(5), 3526–3538. [Two-process sleep model]
Monk, T.H. et al. (1992). Circadian determinants of the postlunch dip in performance. Chronobiology International, 9(5), 323–331. [Afternoon cognitive dip mechanism]
Van Cauter, E. et al. (2000). Age-related changes in slow wave sleep and REM sleep and relationship with growth hormone and cortisol levels in healthy men. JAMA, 284(7), 861–868. [HGH secretion and sleep stages]
Saper, C.B. et al. (2005). Hypothalamic regulation of sleep and circadian rhythms. Nature, 437(7063), 1257–1263. [SCN pacemaker function]
Horne, J.A. & Ostberg, O. (1976). A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. International Journal of Chronobiology, 4(2), 97–110. [Morningness-eveningness validated scale]
Walker, M.P. & Stickgold, R. (2006). Sleep, memory, and plasticity. Annual Review of Psychology, 57, 139–166. [Cognitive consequences of sleep architecture]
Reinberg, A. & Smolensky, M.H. (1992). Circadian changes of drug disposition in man. Clinical Pharmacokinetics, 9(3), 177–221. [Circadian pharmacology, basis for supplement timing]
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