# Hertz. - An anxiety treatment. — Put yourself at ease.

> Breathing exercise app for anxiety reduction using vagus nerve stimulation and biofeedback. (iPhone/iPad app by CSDRED AB.)

- Source: https://appshunter.io/ios/app/hertz-an-anxiety-treatment/id1529146685 (this page in markdown: same URL + `.md`)
- Developer: [CSDRED AB](https://appshunter.io/developer/1529146957)
- Category: Health & Fitness, Medical
- Price: $5.99
- Age rating: 12+
- Requires: iOS 13.0 · 2 MB
- Languages: English
- Released: 2020-12-09
- Data updated: 2026-06-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hertz-an-anxiety-treatment/id1529146685/reviews.md

## What is Hertz.?

Hertz. is an application that coaches you to stimulate your vagus nerve, reducing anxiety, putting you at ease. It also provides biofeedback to increase your conscious control over your anxiety. 

It consists of a focused breathing exercise. A red dot sweeps a dial of ticks. As the dot passes over blue ticks, you breath in, as it passes red ticks you breath out. Your heart rate variability changes the speed of the dot, this feedback will over time allow you to have greater conscious control over your state of anxiety. 

Hertz. connects uses the HealthKit functionality of iOS to obtain the physiological data needed for biofeedback, if you decline to share data with the app it still functions but with emulated feedback.

## Key features

- Vagus nerve stimulation coaching
- Biofeedback for anxiety control
- Focused breathing exercises
- Heart rate variability integration
- Optional HealthKit data usage

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/hertz-an-anxiety-treatment/id1529146685/reviews.md

### 3/5 — Lise

*2023-03-15*

Hello
I love the concept of the watch app
But it seems to get caught up halfway around and the screen dims. Then it jumps ahead
Hopefully you can fix as I think it is the only app like it
I only found it by accident 
I’m using a watch 8 on 9.3.1
Thank you

## Frequently asked questions about Hertz.

### What is Hertz. used for?

Hertz. is designed to help users reduce anxiety by coaching them through a focused breathing exercise that stimulates the vagus nerve. It provides biofeedback to increase conscious control over anxiety states.

### How does Hertz. provide biofeedback?

The app uses a visual cue (a red dot sweeping a dial) that adjusts its speed based on your heart rate variability. This feedback helps you learn to consciously control your anxiety levels.

### Does Hertz. require HealthKit access?

No, HealthKit access is optional. If you decline to share data, Hertz. will function with emulated feedback. However, using HealthKit provides real physiological data for more accurate biofeedback.

### What devices does Hertz. support?

Hertz. is available on Apple Watch, iPhone, and iPod. This allows for convenient use across multiple Apple devices.

### How much does Hertz. cost?

Hertz. is a paid application with a one-time purchase price of $5.99. There are no subscription fees or in-app purchases.

### What is the age rating for Hertz.?

Hertz. has an age rating of 12+. This indicates it is suitable for users aged 12 and older.

### When was Hertz. last updated?

The latest version of Hertz. is 1.3, which was last updated on May 16, 2025. This suggests regular updates to improve the application.

### Does Hertz. have ads?

No, Hertz. does not contain advertisements. As a paid application, it offers an ad-free experience for users.

## Version history (last 4 releases)

### 1.3 — 2025-05-16

- Minor fixes

### 1.2 — 2022-01-03

Fixed the time out screen so it lasts two minutes before timing out on older Apple Watches, and removed a bug that made the app reset after one rotation on newer Apple Watches. The result screen is also changed - score is removed and heart-rate added, for clarity.

Thanks to everyone who gave feedback!

### 1.1 — 2020-12-31

Updates include:

 * Instructions! (swipe up to read the instructions, swipe down to dismiss). 
 * The number of revolutions and the speed can be adjusted from the home screen (9 is the default for revolutions, which at the default speed of 3 takes around 3 minutes).  
 * Updated colours for greater clarity. 
 * A score is given after practice, reflecting how much your vagus was activated. 
 * The screen is now kept alive by periodically nudging the digital crown during practice. 

Thanks to everyone who gave their valuable feedback.

### 1.0 — 2020-12-09

No release notes.

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## More apps by CSDRED AB

- [Hertz-lite. Anxiety relief.](https://appshunter.io/ios/app/hertz-lite-anxiety-relief/id1543873699)

All apps by CSDRED AB: https://appshunter.io/developer/1529146957

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*