calculation plan
How biorhythms will calculate
This page fixes the product's safe logic in advance: birth date is used only for user calculation, and the result is presented as self-observation, not medical conclusion.
Physical cycle: reminder about load, rest, and bodily care.
Emotional cycle: cue about conversation tone and stress response.
Intellectual cycle: reminder about fact-checking and attention quality.
Privacy: birth date should be optional, explained, and deletable.
Do not launch as diagnosis
Before production, add explicit consent, data deletion, formula explanation, no medical promises, and a clear way to disable personalization.