Breather: HRV & Stress

Breather gives you a little space to notice your body's rhythms. Explore heart rate variability (HRV SDNN), resting heart rate and heart rate from Apple Health, with the time of each reading. No ideal score to chase. COMPARE WITH YOUR OWN USUAL PATTERN A personal HRV reference uses valid readings from the previous 28 days: at least 14 readings across 7 different historical days. Each day's median has equal weight. The daily overview compares today's median only when there are at least 2 readings today and the latest is no more than 6 hours old. Insufficient or outdated evidence is clearly labeled. TRENDS WITHOUT INVENTED DATA Browse daily, weekly and monthly trends and individual readings. Missing values are not filled with zero or joined across gaps. Heart rate shows up to 200 accessible readings from the latest 24 hours, not an all-day average. MAKE ROOM FOR YOUR OWN EXPERIENCE Keep feelings, notes and context tags in a private on-device journal. Your writing does not affect HRV comparisons. Delete entries individually. This version does not sync or import/export journals; uninstalling removes local entries. Follow a one-minute breathing rhythm and stop whenever you wish. Breathe naturally; stop if you feel dizzy or uncomfortable. Exercises do not write to Apple Health or promise to change health metrics. OPTIONAL APPLE WATCH REMINDERS Apple Watch reads its own available health records and sends local notifications only after you enable them on the watch. The notification uses State: Take a break, State: Steady or State: Doing well, rather than a stress label. A compact card shows an ink-wash animal, the actual HRV value in ms and its measurement time. Choose Cat, Rabbit, Fox or Capybara in Watch notification settings. The animal is cosmetic; submitted notifications keep their original animal and reading. It is not a numerical stress score. This is an unvalidated HRV-based estimate, not a measurement of psychological stress or a medical diagnosis. A new HRV reading below 80% of your qualified reference maps to Take a break, above 120% to Doing well; other values, including the boundaries, map to Steady. These are HRV reference labels, not findings that your health, mood or recovery is good or normal. Sleep, exercise, alcohol, illness and measurement conditions also affect HRV. Notifications use the latest reading, not the daily median. Only new readings measured after enabling and no more than 1 hour old at processing can qualify. By default, only changed states are notified, at least 15 minutes apart. Choose 15/30/60/120 minutes; default quiet hours are 22:00–08:00. iPhone does not produce these reminders, and the two devices may have different data. System scheduling may delay or prevent updates and alerts; this is not continuous or real-time monitoring. PRIVATE BY DESIGN Breather requests read access only. It does not add or change health records. No account, ads, analytics SDK or app-operated server. Processing stays on-device. Journals and necessary notification state use protected local files excluded from backup. Only the pending and latest accepted notification receipts retain the original HRV value, time, comparison and identifier so the card matches its reading; no HRV history database is created or sent to the developer or third parties. Health and notification access are optional; journal and breathing features work without them. English and Simplified Chinese follow your app/system language. Requires iOS 17 or later; the optional Watch app requires watchOS 10 or later. Breather is for everyday self-observation, not diagnosis, treatment, emergency alerts, or validated stress, recovery or disease scoring. Its reference rules are not clinically validated and cannot replace professional medical advice. Consult a doctor for persistent symptoms or medical decisions.