Night and Day Tracker

Sleep better. Perform better. Feel better.

Night and Day is the sleep and fitness tracker built for people who want serious health insights, without all the fuss. Combining advanced sleep science with beautiful design, get the insights you need to optimize rest and performance.

Best of all? No subscription required. Download once, use forever.

SLEEP SCORE & INSIGHTS Wake up to a personalized sleep score that analyzes duration, quality, consistency, and recovery. Get actionable insights based on your unique patterns—not generic advice.

SLEEP DEBT TRACKING Your body remembers lost sleep, even if you don't. Night and Day calculates your running sleep debt balance using your past two weeks of sleep, showing exactly how much rest you owe yourself.

DESIGNED FOR APPLE WATCH Seamlessly integrates with Apple Watch as well as Oura Ring and any HealthKit-compatible tracker. All your data in one place.

DAILY READINESS SCORE Should you push hard today or take it easy? Your readiness score analyzes sleep quality, heart rate variability (HRV), resting heart rate, sleep debt, and recent activity to tell you how ready your body is to perform.

WEEKLY ACTIVITY POINTS Earn points for every minute your heart rate elevates during exercise and daily activities. Light activity earns 1 point per minute, vigorous activity earns 2x. Hit the WHO-recommended 150 points each week to maintain optimal health.

WORKOUT TRACKING & MAPPING Visualize your runs and rides with GPS route maps color-coded by heart rate zones. See exactly when you hit peak effort and track your performance over time.

ADVANCED RECOVERY METRICS

• HRV baseline comparison tracks your recovery vs. your personal average
• Resting Heart Rate trends reveal stress and fatigue
• Sleep stage analysis (Deep, REM, Core)
• Sleep consistency scoring helps build healthy routines

PRIVACY FIRST Your health data never leaves your device. Everything is processed locally on your iPhone using Apple's secure HealthKit framework.

SCIENCE-BASED APPROACH Built using peer-reviewed sleep and exercise science. Our algorithms are based on research from sleep medicine, sports science, and circadian biology—not guesswork.

BEAUTIFUL DESIGN Gorgeous visualizations make your data easy to understand. Track trends, spot patterns, and celebrate progress with an interface designed for clarity and motivation.

PERFECT FOR:

• Athletes optimizing training and recovery
• Busy professionals balancing stress and rest
• Anyone wanting to improve sleep quality
• Fitness enthusiasts tracking performance
• People managing sleep disorders
• Health-conscious individuals

FEATURES AT A GLANCE:

• Daily sleep score with detailed breakdown
• Sleep debt calculator with 2-week history
• Readiness score combining sleep, HRV, and activity
• Weekly activity point tracking (WHO 150-minute goal)
• Heart rate variability (HRV) monitoring
• Resting heart rate trends
• Sleep stage analysis
• Consistency and regularity scoring
• Personalized daily insights
• Works with all major fitness trackers
• Dark mode optimized
• No ads, no subscriptions. Free to download.

GETTING STARTED:

1. Connect your fitness tracker via Apple Health
2. Sleep with your device overnight
3. Wake up to personalized insights
4. Track your progress over time

Download Night and Day today and start making smarter decisions about your sleep and activity. Your body will thank you.

ABOUT PERMISSIONS: Night and Day requires access to Apple Health to read sleep data, heart rate, workouts, and activity. We never share your data with third parties. Everything stays private on your device.