HeartPeace vs Callibri Biofeedback
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HeartPeace
This app guides meditation through real-time biofeedback based on heart rate variability. It uses visual animations and sounds to reflect your inner peace, helping you focus on breathing and nervous system balance.
- Real-time HRV biofeedback
- Visual inner peace animation
- Auditory feedback with sounds
- Back camera heart rate monitoring
- BLE heart rate monitor support
- Health app integration
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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: —————————————————— 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
Callibri Biofeedback
This system uses a sensor to measure muscle tone and visualizes your muscle activity in a game-like interface. It's designed for self-regulation training to improve muscle strength and bodily functions.
- Muscle tone evaluation (EMG signal)
- Visualizes muscle activity in games
- Muscle restoration for stroke/CP
- Home fitness muscle strengthening
- Increases physiological reserves
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The "Callibri Biofeedback" system is designed for self-regulation training sets prepared by specialists with a goal of being able to manipulate the body's systems at will. The application works with "Callibri" sensor that instantly evaluates muscle tone level (the EMG signal) and the app visualizes muscle activity in the form of a game situation. The Callibri Biofeedback system is used for: • restoration of weakened muscles in stroke and cerebral palsy; • training, increasing the strength and functionality of muscles in the field of home fitness; • increasing and maintaining the physiological reserves of the body.
Screenshots
Verdict
The clearest difference is rating: HeartPeace at 4.5 against Callibri Biofeedback's 3.0. HeartPeace also leads on update cadence (fortnightly vs every 4 months) and ratings volume (32 vs 1). Callibri Biofeedback's advantage is in-app purchases (none vs 1). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. HeartPeace sells 1 one-off in-app purchase. Callibri Biofeedback asks for nothing beyond the download.
HeartPeace holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: HeartPeace has 32 ratings behind it against 1, so its average is the more settled of the two.
HeartPeace ships an update fortnightly, Callibri Biofeedback every 4 months. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.
| Parameter | HeartPeace | Callibri Biofeedback |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (32 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 81.8% of reviews | — |
| Number of ratings | 32 — better | 1 |
| Update frequency | Fortnightly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 89 MB | 269 MB |
| Age rating | 4+ | 12+ |
| Developer | Agustin Prats | BRAINBIT INC. |
Customer experience
HeartPeace
Callibri Biofeedback
In-app purchases
HeartPeace
- Premium Features$6.99
Callibri Biofeedback
No in-app purchases
Questions
Is HeartPeace free?
Is Callibri Biofeedback free?
Which has better reviews, HeartPeace or Callibri Biofeedback?
Do HeartPeace or Callibri Biofeedback have ads?
Which is updated more often, HeartPeace or Callibri Biofeedback?
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