Comparison

Callibri Biofeedback vs Yudemon HRV

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Muscle tone evaluation (EMG signal)
  • Visualizes muscle activity in games
  • Muscle restoration for stroke/CP
  • Home fitness muscle strengthening
  • Increases physiological reserves
Features
Read full description

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.

About

Yudemon HRV

Enhance stress resilience and self-regulation with this visual and sonic tool for resonance breathing and HRV biofeedback. Connect a heart rate monitor for advanced analytics and personalized training journeys. Enjoy dynamic visuals and custom soundscapes designed to optimize your practice.

Highlights
  • Resonance breathing timer
  • HRV biofeedback training
  • ECG heart rate monitor integration
  • Journey Mode for optimal breathing rate
  • Customizable visuals and soundscapes
  • Heartwork generative art based on data
Features
Read full description

Yudemon HRV is a unique visual and sonic tool for resonance breathing and HRV biofeedback training. It provides a fun and engaging workout for your autonomic nervous system, helping you build stress resilience and enhanced self-regulation. You can either use the app as a basic breath timer, or connect an ECG-based heart rate monitor (like the Polar H10) via Bluetooth for full biofeedback and analytics. Unless you specifically opt-in to cloud sync, all data processing happens on your device, so your data is completely secure. Using Yudemon with a heart rate monitor not only allows you to track and visualise your data for each session, it also enables you to use Yudemon's Journey Mode, a novel and unique way of establishing your own optimal breathing rate over the course of multiple sessions. Yudemon's adjustable visuals and soundscapes offer infinite variations, making every breathing session feel fresh and engaging. By default, the app’s appearance automatically changes on a daily basis. Or, with Yudemon Pro, you can take full control and customize everything manually. A healthy heart does not beat like a metronome but constantly adapts to the requirements of the present moment. Heart rate variability (HRV) biofeedback training and resonance breathing are based on the fact that our breathing has a direct impact on the rest of our physiology. By controlling our breathing in specific ways we can train our body to become more adaptable and perform better under stress. Yudemon helps you with this practice. Yudemon HRV is the first breathing app with custom soundsapes and functional music specifically designed for resonance breathing and HRV biofeedback training. The soundscapes guide you in your breathing sessions and aim to enhance the effects of the practice. It also integrates other aspects of generative art, such as the "Heartwork", a unique piece of art based on your very own physiological data that is generated and grows with you as you complete more sessions. New visuals, soundscapes, and effects are added on a regular basis. Terms of Service: https://app.yudemon.com/terms Privacy Policy: https://app.yudemon.com/privacy

Screenshots

Callibri Biofeedback4 screens
Yudemon HRV4 screens

Verdict

The call

The clearest difference is rating: Yudemon HRV at 4.5 against Callibri Biofeedback's 3.0. Yudemon HRV also leads on update cadence (every 2 days vs every 4 months) and ratings volume (13 vs 1). Callibri Biofeedback's advantage is in-app purchases (none vs 4). On price, ads and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Yudemon HRV sells 4 in-app purchases, starting at $2.99 per month. Callibri Biofeedback asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Yudemon HRV holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Yudemon HRV has 13 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Callibri Biofeedback ships an update every 4 months, Yudemon HRV every 2 days. Both last shipped on November 3, 2026.

Scorecard6 real differences · 4 level
Callibri Biofeedback versus Yudemon HRV: the parameters behind the verdict, then further details
ParameterCallibri BiofeedbackYudemon HRV
PriceFreeFree
Rating3.0 (1 ratings)4.5 (13 ratings) — better
Positive reviews—91.7% of reviews
Number of ratings113 — better
Update frequencyEvery 4 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size269 MB175 MB
Age rating12+4+
DeveloperBRAINBIT INC.Yudemon LLC

Customer experience

Callibri Biofeedback

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%

Yudemon HRV

All ratings13 ratings
Positive84.6%
Neutral15.4%
Negative0.0%
Written reviews12 reviews
Positive91.7%
Neutral0.0%
Negative8.3%

In-app purchases

None

Callibri Biofeedback

No in-app purchases

4 purchases

Yudemon HRV

Subscriptions4
  • Yudemon Pro (Monthly)$2.991 Month
  • Yudemon Pro (Monthly)$4.991 Month
  • Yudemon Pro (Yearly)$19.991 Year
Show 1 more
  • Yudemon Pro (Yearly)$29.991 Year

Questions

Is Callibri Biofeedback free?
Callibri Biofeedback is free to download, with no in-app purchases.
Is Yudemon HRV free?
Yudemon HRV is free to download, with in-app purchases available.
Which has better reviews, Callibri Biofeedback or Yudemon HRV?
Yudemon HRV is rated higher. Callibri Biofeedback averages 3.0 out of 5 from 1 ratings, while Yudemon HRV averages 4.5 from 13 ratings.
Do Callibri Biofeedback or Yudemon HRV have ads?
Neither Callibri Biofeedback nor Yudemon HRV shows ads.
Which is updated more often, Callibri Biofeedback or Yudemon HRV?
Callibri Biofeedback ships an update every 4 months, and Yudemon HRV every 2 days. Most recently, Callibri Biofeedback was updated on November 3, 2026 and Yudemon HRV on November 3, 2026.

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