§ 01
Normalise each input
Every signal is mapped to a 0 – 100 score against your personal 14-day baseline. No one's baseline is someone else's.
Today's WVI
70
Good
Weekly trajectory
71
4-week
if you hold this rhythm
73
12-week
compound effect
§ 01 · Your inputs
Move four sliders. Get tomorrow's WVI.
Drag any slider. The central arc updates in real time, the projection curve redraws, and the contribution bars show which signal moved the needle.
Sleep quality78
How rested you feel out of 100. Good depth, no wakes.
HRV66
Heart rate variability in milliseconds. Higher = calmer autonomic system.
Stress load ↓28
Perceived stress 0 – 100. Lower is better.
Activity58
MVPA minutes scaled 0 – 100. Move, but don’t overdo it.
§ 02 · Where it comes from
Each slider contributes a different amount.
This is not smoke and mirrors — these are the real relative weights the engine uses. Higher HRV moves the needle more than one extra hour of stress relief. Sleep is slightly heavier than activity. The bars below rescale with every slider move.
HRV+21.1
Sleep quality+23.4
Stress load+16.6
Activity+8.7
§ 03 · How it’s computed
Four moves, no black box.
The real formula is public. Here’s the human version, step by step.
§ 02
Apply the weights
Each normalised score is multiplied by its fixed engine weight. HRV is 0.18, Stress 0.15, Sleep 0.13, Activity 0.08, and so on down the list.
§ 03
Adjust for the time of day
Weights shift automatically. Night leans on sleep and HRV. Morning on HRV and stress. Workday on stress and activity. The same inputs can produce different scores at different hours — and that’s the point.
§ 04
Publish one number
Sum the weighted pieces. Round to an integer. That’s your WVI, in the band colour of the moment. The rest of the app is just language around this one number.
§ 04 · Which band are you in
Seven bands. One colour language.
The score band decides the tone of every notification the app sends you today. Below 40, yield pauses — the app shifts into recovery-helper mode.
90 – 100
Superb
80 – 89
Excellent
65 – 79
Good
50 – 64
Moderate
35 – 49
Low
20 – 34
Poor
0 – 19
Dangerous
Honest note
This is a preview. Your real WVI uses twelve inputs, continuous biometrics from a real bracelet, and a live emotional-state classifier. The calculator gives you the right intuition — the real thing gives you the right number.