# SelfLoops HRV vs zimetrix

The clearest difference is in-app purchases: zimetrix at none against SelfLoops HRV's 1. zimetrix also leads on update cadence (fortnightly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SelfLoops HRV sells 1 one-off in-app purchase. zimetrix asks for nothing beyond the download.

SelfLoops HRV ships an update every 4 months, zimetrix fortnightly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SelfLoops HRV | zimetrix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/selfloops-hrv/id921130546/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 58 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SelfLoops](https://appshunter.io/developer/911739721) | [Alfredo Zimperz](https://appshunter.io/developer/1803612667) |

## What reviewers say

### SelfLoops HRV

[App page](https://appshunter.io/ios/app/selfloops-hrv/id921130546)

This app measures and analyzes heart rate variability (HRV) using Bluetooth heart rate monitors. It helps users track recovery, stress, and training readiness to optimize performance. Advanced metrics are provided for sports science and research applications.

**Highlights:** Accurate HRV measurement, Daily recovery & readiness tracking, Clear trend monitoring, Intuitive interface, Bluetooth heart rate monitor compatible, Sports science metrics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HRV premium | $3.99 | one-time |


### zimetrix

[App page](https://appshunter.io/ios/app/zimetrix/id6749155081)

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

**In-app purchases:** none


## Frequently asked questions

### Is SelfLoops HRV free?

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

### Is zimetrix free?

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

### Do SelfLoops HRV or zimetrix have ads?

Neither SelfLoops HRV nor zimetrix shows ads.

### Which is updated more often, SelfLoops HRV or zimetrix?

SelfLoops HRV ships an update every 4 months, and zimetrix fortnightly. Most recently, SelfLoops HRV was updated on November 1, 2026 and zimetrix on October 30, 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.*