# Optimal HRV vs sleep² sleeptracker & analysis

The clearest difference is review sentiment: sleep² sleeptracker & analysis at 62% against Optimal HRV's 17%. sleep² sleeptracker & analysis also leads on rating (3.6 vs 3.0). Optimal HRV's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Optimal HRV sells 3 in-app purchases, starting at $9.99 per month and sleep² sleeptracker & analysis sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

sleep² sleeptracker & analysis holds the better App Store score, 3.6 against 3.0. Both are backed by a comparable volume of ratings — 24 and 37 respectively. Written reviews point the same way: 17% of Optimal HRV's written reviews are positive against 62% of sleep² sleeptracker & analysis's.

Optimal HRV ships an update fortnightly, sleep² sleeptracker & analysis every 2 weeks. The most recent releases landed on October 8, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Optimal HRV | sleep² sleeptracker & analysis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (24 ratings)](https://appshunter.io/ios/app/optimal-hrv-biofeedback/id1501292206/reviews) | **[3.6 (37 ratings)](https://appshunter.io/ios/app/sleep-sleeptracker-and-analysis/id1629426238/reviews)** |
| Number of ratings | 24 | **37** |
| Positive reviews | 16.7% of reviews | **61.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 52 MB | 110 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Optimal, LLC](https://appshunter.io/developer/1501292205) | [Nukkuaa](https://appshunter.io/developer/1629426240) |

## 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 |


### sleep² sleeptracker & analysis

[App page](https://appshunter.io/ios/app/sleep-sleeptracker-and-analysis/id1629426238)

This app acts as a personal guide to better sleep, combining innovative sleep training with precise sleep tracking and analysis. It offers an EU-approved medical device program for acute sleep disorders like insomnia, providing personalized recommendations and sleep training based on your data.

**Highlights:** Sleep tracking and analysis, Sleep training programs, Personalized recommendations, Interactive chatbot, Data import (Polar sensor, Apple Health), Manual sleep diary entry

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| sleep² PRO | $9.99 | per month |
| sleep² PRO | $79.99 | per year |
| sleep² intensive program | $39.99 | one-time |
| sleep² intensive program | $99.99 | one-time |


## Frequently asked questions

### Is Optimal HRV free?

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

### Is sleep² sleeptracker & analysis free?

sleep² sleeptracker & analysis is free to download, with in-app purchases available.

### Which has better reviews, Optimal HRV or sleep² sleeptracker & analysis?

sleep² sleeptracker & analysis is rated higher. Optimal HRV averages 3.0 out of 5 from 24 ratings, while sleep² sleeptracker & analysis averages 3.6 from 37 ratings.

### Do Optimal HRV or sleep² sleeptracker & analysis have ads?

Neither Optimal HRV nor sleep² sleeptracker & analysis shows ads.

### Which is updated more often, Optimal HRV or sleep² sleeptracker & analysis?

Optimal HRV ships an update fortnightly, and sleep² sleeptracker & analysis every 2 weeks. Most recently, Optimal HRV was updated on October 8, 2026 and sleep² sleeptracker & analysis on October 22, 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.*