# Optimal HRV vs Calm Awareness

The clearest difference is in-app purchases: Calm Awareness at none against Optimal HRV's 3. Calm Awareness also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, 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. Calm Awareness asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Optimal HRV | Calm Awareness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (24 ratings)](https://appshunter.io/ios/app/optimal-hrv-biofeedback/id1501292206/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 57 MB | 355 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Optimal, LLC](https://appshunter.io/developer/1501292205) | [BrainTrain Inc.](https://appshunter.io/developer/584469134) |

## What reviewers say

### Optimal HRV

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

This app uses heart rate variability (HRV) and biofeedback to help you manage stress and improve your body's ability to calm down. It offers guided sessions, personalized breathing rhythms, and real-time feedback to train your nervous system for better stress resilience.

**Highlights:** Real-time HRV data and biofeedback, Personalized breathing rhythm identification, Guided mindfulness sessions, Daily check-ins and progress tracking, External sensor integration for accuracy, Multi-language support

**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 |


### Calm Awareness

[App page](https://appshunter.io/ios/app/calm-awareness/id6450367887)

**In-app purchases:** none


## Frequently asked questions

### Is Optimal HRV free?

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

### Is Calm Awareness free?

Calm Awareness is free to download, with no in-app purchases.

### Do Optimal HRV or Calm Awareness have ads?

Neither Optimal HRV nor Calm Awareness shows ads.

### Which is updated more often, Optimal HRV or Calm Awareness?

Optimal HRV ships an update fortnightly, and Calm Awareness fortnightly. Most recently, Optimal HRV was updated on November 3, 2026 and Calm Awareness on November 3, 2026.

---

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