NightGuard: Sleep & Habits
Smart Sleep & Habit Tracker
About
This AI-powered health app analyzes your sleep patterns using on-device machine learning and integrates with Apple HealthKit. It provides personalized insights and recommendations to scientifically improve your rest and overall sleep quality.
What's New in NightGuard
V3.1.0
February 9, 2026
1. A Fresh Visual Identity - Modern color upgrade: The app's theme has been refreshed with deep Indigo & Purple tones, delivering a more premium, immersive nighttime guardian experience. - Full Dark Mode and Light Mode support — the interface looks stunning in any environment. - More natural time display: Optimized time formatting throughout the app for clearer, more intuitive readability. 2. Smarter Sleep Analysis - New sleep data source selector: Choose which device's sleep data to analyze for more precise results. - New weekly view: See your sleep quality trends at a glance and easily spot patterns in your routine. - AI sleep insights fully upgraded — faster generation with more personalized recommendations. 3. Data Accuracy & Privacy - Fixed display logic for sleep records and physiological metrics, ensuring more consistent and reliable feedback for SpO2, sleep duration, and other key data. - Enhanced privacy protection: The underlying logging system has been fully upgraded with privacy redaction to safeguard your sensitive health data more rigorously. 4. Lighter & Faster - Major performance optimization: Removed thousands of lines of redundant code for a smaller footprint and faster launch. - Resolved dashboard stuttering and redundant refresh issues in certain scenarios. - Fixed weekly chart display, subscription lock state, and other known issues.
MoreSubscription plans
Monthly Subscription
AI Enhanced Monthly Subscription unlock AI analysis
Developer apps
FAQ
What is NightGuard's sleep scoring based on?
NightGuard uses a hybrid AI approach, combining a CoreML Transformer deep learning model with a lightweight neural network. This system generates precise sleep quality scores (0-100) by analyzing sleep stages, duration, and efficiency, all processed locally on your device.
What health metrics does NightGuard track?
NightGuard integrates deeply with Apple HealthKit to monitor physiological data including heart rate, heart rate variability (HRV), blood oxygen saturation (SpO2), respiratory rate, and body temperature.
How does NightGuard personalize sleep insights?
The app dynamically adjusts its scoring standards based on your age, gender, and historical data. This allows NightGuard to deliver actionable sleep improvement recommendations tailored specifically to you.
Does NightGuard have ads?
No, NightGuard is ad-free. The app focuses on providing a seamless and uninterrupted user experience for sleep analysis and improvement.
What subscription plans are available for NightGuard?
NightGuard offers a Monthly Subscription at $4.99/month with a 3-day free trial, an AI Enhanced Quarterly Subscription for $9.99/quarter with a 7-day free trial, and an AI Enhanced Annual Subscription for $29.99/year with a 7-day free trial.
How does NightGuard handle user privacy?
NightGuard is designed with privacy as a priority. All AI inference runs locally on your device, ensuring your health data never leaves it. Secure iCloud sync is available for data consistency across devices.
Can NightGuard analyze sleep data from different devices?
Yes, NightGuard features Smart Data Source Management, allowing you to choose which device's sleep data to analyze. This ensures your sleep scores are based on the most accurate available source.
How frequently is NightGuard updated?
The latest version of NightGuard is V3.1.0, and it was last updated on February 9, 2026. This indicates a commitment to regular updates and improvements.
