How MaxDex Actually Works
The MaxDex Energy Index is a 0-100 score built from seven weighted physiological drivers, summed into an arousal value and mapped through a sigmoid. It implements Borbély’s two-process model of sleep regulation and the Banister two-component training model, and it runs entirely on your device.
We publish this for a simple reason: a number you cannot interrogate is a number you have to take on faith, and we would rather you did not have to. Every constant on these pages is the one shipping in the app. Where we have not measured something — and there is a lot we have not measured — we say so on the limits page rather than rounding it into a confident claim.
The method, page by page
Methodology
How the MaxDex Energy Index Is Calculated
The full formula behind the MaxDex Energy Index: seven weighted physiological drivers, a sigmoid mapping to 0-100, and the published models each driver comes from.
Methodology
Circadian Rhythm & Sleep Pressure: Process C and Process S
How MaxDex implements Borbély’s two-process model: sleep pressure accumulating over a 15-hour constant, a circadian curve peaking at 16:00, and chronotype inferred from your sleep midpoints.
Methodology
How Phone-Only Sleep Detection Works (and How Accurate It Is)
The BES fusion algorithm behind MaxDex sleep tracking: three parallel detectors, efficiency and disturbance scoring, confidence weighting, and an honest account of what a phone cannot measure.
Methodology
Training Load and Meal Response in the Energy Model
How MaxDex models exercise and food: a Banister two-component fitness-fatigue model with modality-specific recovery, and a postprandial curve that predicts when a meal will drag.
Methodology
Limits of the MaxDex Energy Model — What We Do Not Claim
An explicit list of what the MaxDex energy model cannot do: no heart rate or HRV, no sleep staging, no validation study, and one driver currently switched off.
Methodology
Editorial Policy: How We Research, Review and Correct
How MaxDex Services researches and reviews published content: sourcing rules, review cadence, the line between designing for an audience and clinical claims, and how to report an error.