01
Connect
Bring the wearable history you already have from WHOOP or Apple Health.
Private founding cohort
Find out what actually works for you.
Your wearable tells you what happened. Veille helps you understand why—and test it on yourself.
Join the founding cohort For WHOOP, Apple Watch and Oura users
Private by designEvidence, not guessesiPhone first
Veille insight
EmergingSleep · Caffeine
Late caffeine may be affecting your sleep.
Across 18 comparable nights, sleep efficiency was lower when caffeine came after 2 PM.
Before 2 PM
89.2%
vs.
After 2 PM
85.1%
A reason to test—not a verdict.
Work stress may explain part of the difference.
Suggested next step
No caffeine after 1 PM · 12 days
Illustrative insight · Not medical advice
The missing layer
You already have the data. You still don't have the answer.
Wearables are excellent at measuring sleep, HRV, recovery and training load. But when something changes, the hardest question remains: why?
?Why was my energy low?
?Does caffeine affect my sleep?
?What changes my recovery?
How it works
Turn a hunch into something you can learn from.
02
Add context
Log energy, stress and the moments that matter in a few seconds.
03
Learn
See personal patterns alongside uncertainty and possible confounders.
04
Test
Run a simple personal experiment and replace guessing with evidence.
ObserveHypothesizeTestLearn
From a pattern to an answer
A learning loop that ends with evidence.
Veille does not jump from correlation to certainty. It helps you turn an observation into a testable question.
Observation
Your sleep is often worse after late caffeine.
A pattern worth examining
Question
Is caffeine the reason—or are those simply stressful workdays?
Confounder identified
Experiment
12 days with no caffeine after 1 PM.
One change, tracked consistently
Result
Sleep efficiency improved by 3.8% on adherent days.
Evidence updated
Veille updates what it knows about you.
Why Veille
Not another health dashboard.
Personal evidence
Learn from your own history and response—not only population averages.
Experiments, not confident guesses
Veille keeps observations separate from patterns you have actually tested.
Gets smarter over time
Every useful observation and experiment updates what Veille knows about you.
Privacy by design
Your health data is personal. Veille should treat it that way.
- ✓Health and context data processed locally where practical
- ✓No advertising use of health data
- ✓Every conclusion keeps its source and level of evidence
- ✓Delete your data when you choose
Founding cohort
Help shape Veille from the beginning.
We're starting with a small group of people who already track their health and have a real question they want to answer.
A small cohort.
Thoughtful feedback.