Flux: Hydration Science
Circadian Hydration Optimizer
Free · Designed for iPad. Not verified for macOS.
Most people drink water. Few drink it right.
Flux is the first hydration app built on circadian biology - the same neuroscience research discussed by leading scientists. It's not about drinking more. It's about drinking at the right time, in the right amount, for your body.
HOW FLUX WORKS
Your hydration needs aren't the same every hour of the day. Your brain, muscles, and metabolism follow a precise biological clock - and your water intake should too.
Flux calculates your personalized daily target based on:
- Body weight (ml/kg formula)
- Your wake and sleep times (circadian window)
- Training frequency and intensity
- Weather and ambient temperature
- Caffeine and alcohol intake
Then it tells you exactly when and how much to drink - from your morning protocol (500ml within 30 minutes of waking) to your evening cutoff (2-3 hours before sleep).
WHAT MAKES FLUX DIFFERENT
Every other water tracker asks you to log drinks. Flux tells you when to drink before you get thirsty. Because by the time you feel thirsty, you're already 1-2% dehydrated - that's a 10-20% drop in physical performance and a measurable decline in cognitive function.
- Circadian timing protocols, not random reminders
- Personalized to your body weight, schedule, and lifestyle
- Training adaptation, adjusts targets on workout days
- Weather-aware, live temperature and humidity adjustments
- Apple Health integration, automatic sync with your activity data
- Dynamic Island and Live Activities, your hydration status always visible
- Smart reminders, timed to your circadian window
THE SCIENCE
Flux is built on peer-reviewed research in hydration physiology and circadian biology. Our protocols reference published work from Stanford neuroscience research and leading hydration scientists including Dr. Samuel Cheuvront and Dr. Robert Kenefick.
We don't invent protocols. We implement the ones that already work.
FOR ATHLETES AND HIGH PERFORMERS
Flux is built for people who take performance seriously - athletes, biohackers, founders, and anyone optimizing their mental and
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Adding new location to get city temperature and adapt consequently
The developer, Thomas OTTONE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Thomas OTTONE
- Size
- 6.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 2 more
- English, French, German
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Infrequent
Profanity or Crude Humor
Contests
Contains
Health or Wellness Topics
- Copyright
- © 2026 Flux Hydration