Vari — Hydration Intelligence
See how water moves your heart rate, sleep, and energy
ari is the only hydration tracker that shows you exactly how water affects your body — your
heart rate, your sleep, your energy levels.
Other apps count cups. Vari pairs every drink you log with Apple Health data already on your
iPhone, then surfaces correlations specific to you. After a week, you'll see insights like "you
sleep 23 minutes longer on days you hit your goal" — computed from your own data, not generic
advice.
We built Vari because we were tired of hydration apps that just nag you to drink water. Nobody
changes behavior from a reminder. People change when they see proof that it works — and that
proof is already sitting in your Apple Health data, unused.
Features
🔬 Hydration ↔ Health Correlations
Pearson correlations between your hydration and resting heart rate, sleep duration, active
energy, and HRV. Computed from your last 14 days of paired data.
❤️ Bidirectional Apple Health Sync
Every drink writes to Apple Health. Every health metric reads back. No half-integration.
🎯 Personalized Goals
Your daily goal adapts to weight, activity level, caffeine intake, and health conditions. Not a
generic "8 glasses."
⚡ Flow Score
A 6-component score (hydration balance, caffeine timing, consistency, activity match, recovery,
timing distribution) that tells you how well you're hydrating — not just how much.
🔕 Smart Reminders
Quiet during meetings (calendar-aware), active during workouts. Respects your schedule instead
of interrupting it.
📊 Liquid Calorie Tracking
30 beverages with hydration factors and calorie data. See how your daily liquid calories stack
up alongside hydration.
🔥 Streaks & Challenges
Track consistency with friends. 3-day hydration challenges with WhatsApp sharing.
Use Cases
👩💻 Office Professionals
"I kept crashing at 2 PM. Vari showed me I wasn't drinking anything between 11 AM and 3 PM.
Fixed that gap, no more afternoon slump."
🏃 Fitness Enthusiasts
"I track runs with Apple Watch. Now Vari shows me my resting heart rate is 3 bpm lower on days
I hit my water goal. That's not a reminder — that's data."
🤰 Health-Conscious Individuals
"Pregnancy increased my water needs by 300ml/day. Vari calculated that automatically and
adjusts my goal based on activity level."
☕ Caffeine Optimizers
"Vari's caffeine timing score showed me my 4 PM coffee was destroying my sleep. Moved it to 1
PM — sleep improved by 20 minutes."
📱 Quantified Self
"I've tried 5 water apps. They all count cups. Vari is the first one that connects hydration to
actual health outcomes from my Apple Watch data."
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Comments
I built Vari because every hydration app I tried just counted cups and sent annoying reminders. Nobody changed their behavior from a notification saying "drink water." What actually changed my behavior: seeing that my resting heart rate was 3 bpm lower on days I hit my water goal. That's not a reminder — that's proof. Vari connects your drink logs to Apple Health data you're already collecting (heart rate, sleep, HRV, active energy) and shows you the correlations specific to YOUR body. After 7 days, you get insights like "you sleep 23 minutes longer on hydrated days." The entire intelligence layer is computed on-device. Your health data never leaves your phone. Built solo. Shipped in 4 weeks. Currently on TestFlight, heading to App Store. Would love your feedback — especially on what insights you'd want to see from your own hydration data.
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Comments
I built Vari because every hydration app I tried just counted cups and sent annoying reminders. Nobody changed their behavior from a notification saying "drink water." What actually changed my behavior: seeing that my resting heart rate was 3 bpm lower on days I hit my water goal. That's not a reminder — that's proof. Vari connects your drink logs to Apple Health data you're already collecting (heart rate, sleep, HRV, active energy) and shows you the correlations specific to YOUR body. After 7 days, you get insights like "you sleep 23 minutes longer on hydrated days." The entire intelligence layer is computed on-device. Your health data never leaves your phone. Built solo. Shipped in 4 weeks. Currently on TestFlight, heading to App Store. Would love your feedback — especially on what insights you'd want to see from your own hydration data.
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