# Optimal HRV vs Callibri Biofeedback

The clearest difference is in-app purchases: Callibri Biofeedback at none against Optimal HRV's 3. Optimal HRV's advantage is update cadence (fortnightly vs every 4 months) and ratings volume (24 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. Optimal HRV sells 3 in-app purchases, starting at $9.99 per month. Callibri Biofeedback asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for Optimal HRV against 3.0 for Callibri Biofeedback. That said, the two scores are not equally well evidenced: Optimal HRV has 24 ratings behind it against 1, so its average is the more settled of the two.

Optimal HRV ships an update fortnightly, Callibri Biofeedback every 4 months. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Optimal HRV | Callibri Biofeedback |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (24 ratings)](https://appshunter.io/ios/app/optimal-hrv-biofeedback/id1501292206/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/callibri-biofeedback/id1517798639/reviews) |
| Number of ratings | **24** | 1 |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 56 MB | 269 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Optimal, LLC](https://appshunter.io/developer/1501292205) | [BRAINBIT INC.](https://appshunter.io/developer/1510548622) |

## What reviewers say

### Optimal HRV

[App page](https://appshunter.io/ios/app/optimal-hrv-biofeedback/id1501292206)

Monitor, analyze, and improve your Heart Rate Variability (HRV) scores. This app offers personalized training, biofeedback, and stress-reducing activities to enhance health, reduce stress, and improve mental clarity.

**Highlights:** Real-time HRV monitoring, Personalized training plans, Guided meditation and breathing exercises, Comprehensive data analysis, Stress response insights, Biofeedback optimization

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $9.99 | per month |
| 6 Month | $47.99 | per 6 months |
| One Year | $59.99 | per year |


### Callibri Biofeedback

[App page](https://appshunter.io/ios/app/callibri-biofeedback/id1517798639)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Optimal HRV free?

Optimal HRV is free to download, with in-app purchases available.

### Is Callibri Biofeedback free?

Callibri Biofeedback is free to download, with no in-app purchases.

### Which has better reviews, Optimal HRV or Callibri Biofeedback?

Optimal HRV is rated higher. Optimal HRV averages 3.0 out of 5 from 24 ratings, while Callibri Biofeedback averages 3.0 from 1 ratings.

### Do Optimal HRV or Callibri Biofeedback have ads?

Neither Optimal HRV nor Callibri Biofeedback shows ads.

### Which is updated more often, Optimal HRV or Callibri Biofeedback?

Optimal HRV ships an update fortnightly, and Callibri Biofeedback every 4 months. Most recently, Optimal HRV was updated on October 25, 2026 and Callibri Biofeedback on October 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*