HeartPeace

HeartPeace helps you to meditate by providing real-time feedback about your inner peace.
The feedback is provided by measuring your cardiac coherence using heart rate variability analysis algorithms that determine your parasympathetic vs sympathetic nervous system activation. Therefore, a heart rate monitor is required.
You can use the back camera as a heart rate monitor but it's recommended to use a BLE heart rate monitor because they are more accurate, allow more freedom of movement, work while the screen is turned off and consume less battery. More info about compatible monitors in settings.
The feedback is given by displaying an animation that resembles your inner state. The more inner peace, the bigger, slower, and blueish the animation will be.
Feedback is also presented using sounds so headphones are recommended, if you have low inner peace you will hear a crowd sound but if your inner peace is high you will hear monks meditating and deep sounds.
To better focus on breathing is advised to sit down, use headphones, and close your eyes to minimize distractions.
The app has option to integrate with the Health app by storing sessions as mindfulness sessions.
Note:
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You can select in preferences the back camera to measure heart rate from your finger. Place your finger gently over the back camera and flash and try not to move it much.
Although the camera heart rate monitor works fine it's recommended to use a BLE heart rate monitor because it's more accurate, allows more freedom of movement, consumes less battery, and works while the screen is turned off.
Only heart rate monitors that accurately measure R-R intervals and have Bluetooth 4.0 (BLE) are supported.
Here are a few that have been proven to work well:
· Polar H7, H9 or H10
· CooSpo H6
· Wahoo TICKR
· 4iiii Viiiiva
· Zephyr HxM
· Cardiosport TP3
· Suunto Smart Belt
· R1 Blue Sigma Sport
Not compatible devices:
· Apple Watch
· Wahoo TICKR FIT Heart Rate Armband
· Wahoo BLUEHR
· Polar OH1 Armband
· Vernier Go Wireless Heart Rate
· MyZone MZ-3
· UnderArmour UA Heart Rate
· LifeBEAM hats
· Decathlon GEONAUTE
· TomTom BLE HRM
· Mio ALPHA
· Scosche RHYTHM+
· Fitbit Charge HR
· Lezyne HRM
· Most cheap chest AliExpress straps
· Knock off brand monitors