Calmgraph: Stress Score & HRV
Track triggers. See progress.
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
One-time purchase. No subscription, no account, no cloud. Your stress score stays on your device - see what moves it, week by week.
Calmgraph turns your daily stress into one number you can actually act on - fully on-device, no subscription.
- Stress score (0-100)
From Apple Watch HRV, resting heart rate, and sleep, measured against YOUR personal baseline rather than a single absolute value. The first 14 days are a calibration period shown as provisional.
- Cause tags
Tag work, sleep, exercise, caffeine and more, layered onto your score so you can see what may have moved it.
- Weekly insight
See what likely moved your score each week. These are correlations, not conclusions.
- No Apple Watch? No problem
Quick 1-tap check-ins give you the same visualization.
- One-time purchase, not a subscription.
All measurements are processed on your device. Nothing is sent off-device, collected, or used for advertising.
Calmgraph is not a medical device and is not intended to diagnose or treat any condition. Consult a healthcare professional about any health concern.
Pro: Widget · Breathing guide · Export.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, YANGLI CHEN, 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
- YANGLI CHEN
- Size
- 5.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 32 more
- English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Calmgraph Pro $9.99
- Copyright
- © 2026 CHEN YANGLI