Science & Knowledge Hub · Methods
How Vitality Tracker computes what it shows you
Articles answer why. Method notes answer how we compute: one engine, its inputs, its sources, its limits and its version. Each note is published with a version line, a cite-as line and a CC BY 4.0 notice, and the full sleep specification is deposited on Zenodo with the external review that changed it.
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Any change to a formula, parameter or input rule bumps the version, is logged with its reason and recomputes history with both values kept. Text is licensed CC BY 4.0; the engines' code is not covered by the license.
Vitality Tracker describes and tracks physiological measures recorded by your own consumer devices against your own history. It does not diagnose, predict or monitor any disease.
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