# Caffix vs Stress Tracker HRV

The clearest difference is price: Caffix at Free against Stress Tracker HRV's $7.99. Stress Tracker HRV's advantage is iOS requirement (13.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Caffix is free to download; Stress Tracker HRV costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Caffix ships an update every 3 weeks, Stress Tracker HRV every 5 weeks. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Caffix | Stress Tracker HRV |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stress-tracker-hrv/id6748257580/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | — | Paid |
| Size | 314 MB | 5 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPod, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Tunde Timea Bartha](https://appshunter.io/developer/1731109217) | [Alvaro Garcia Pizarro](https://appshunter.io/developer/1822790774) |

## What reviewers say

### Caffix

[App page](https://appshunter.io/ios/app/caffix/id6744583258)

**Features:** macOS Compatibility

**In-app purchases:** none


### Stress Tracker HRV

[App page](https://appshunter.io/ios/app/stress-tracker-hrv/id6748257580)

Monitor your body's stress levels, sleep quality, and recovery using Heart Rate Variability (HRV) data from your Apple Watch. Gain insights into your mental and physical well-being to make informed decisions about rest and activity.

**Highlights:** Real-time stress tracking via HRV, Daily and weekly stress trend analysis, Recovery Index for bounce-back assessment, Sleep score and optimization insights, On-device data privacy

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Caffix free?

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

### Is Stress Tracker HRV free?

Stress Tracker HRV costs $7.99, with no in-app purchases.

### Do Caffix or Stress Tracker HRV have ads?

Neither Caffix nor Stress Tracker HRV shows ads.

### Which is updated more often, Caffix or Stress Tracker HRV?

Caffix ships an update every 3 weeks, and Stress Tracker HRV every 5 weeks. Most recently, Caffix was updated on October 24, 2026 and Stress Tracker HRV on October 6, 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.*