Calmgraph: Stress & HRV
Daily stress score tracker
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
One-time purchase. No subscription, no account, no cloud. Fix past days on the calendar and see which tags actually move your score, week after 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 and calendar
Tag work, sleep, exercise, caffeine and more, layered onto your score. The calendar view shows a month at a glance, and you can tap any past day to fix its tags or check-in.
■ Weekly insight and tag correlations
See what likely moved your score each week. The Pro correlation report compares your average on days with a tag against days without it, and always shows the sample size. These are correlations, not conclusions. Step count, respiratory rate and deep sleep appear alongside as automatic tags, split at your own quartiles. They never change the score itself.
■ Apple Watch and widgets
The Watch app and complication put your score on your watch face and let you check in from your wrist - free. Home and Lock Screen widgets are part of Pro.
■ Breathing guide and reminders
A 1, 3, or 5 minute breathing guide for the days that sit in the strain band. Daily logging reminders and a weekly review notification are optional.
■ One-time purchase and backup
Buy once instead of subscribing. There is no cloud sync, but you can export a backup to a single file and restore it on another device.
■ Monthly & yearly summary / Weekly history (Pro)
Averages by month and year, with the calm / mixed / strained mix. Past weeks with their average and what was moving your score.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The screen no longer dims during a breathing session (5-minute sessions were going dark part-way).
Fixed a case where a tag set on Apple Watch could flip back on its own.
Fixed “Normalize to 100%” leaving the weights at 105%, which made Apply impossible to press.
Steps, breathing rate and deep sleep from Apple Watch now appear as automatic tags in the correlation report (Pro). Your score is calculated exactly as before.
The calendar has a year view, and both month and year now show the average and the days per band.
You can set where the score bands (strain / middle / calm) change. Score values do not change.
Two new Apple Watch complications: a 7-day trend and a one-tap check-in.
The comparison table now lists the monthly & yearly summary and the weekly history.
Past weeks in the weekly history no longer say “this week”.
Deleting a tag or a check-in now asks first (it used to happen on the tap).
Fixed mistranslations in Russian, Ukrainian, Vietnamese and Malay.
The PDF report headings are no longer in English only.
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
- 10.3 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. All rights reserved.
