# Physiological Sigh vs Heed

The clearest difference is iOS requirement: Heed at 17.0 against Physiological Sigh's 26.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Physiological Sigh sells 2 in-app purchases, starting at $2.99 per month and Heed sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Physiological Sigh | Heed |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/physiological-sigh/id6764079116/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 304 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [emmanuel orvain](https://appshunter.io/developer/1025308595) | [SK95 Engineering AB](https://appshunter.io/developer/1803628230) |

## What reviewers say

### Physiological Sigh

[App page](https://appshunter.io/ios/app/physiological-sigh/id6764079116)

This app guides you through a scientifically proven breathing technique to quickly calm your nervous system and reduce stress. It requires no prior meditation experience and offers customizable durations and ambient sounds for a personalized experience.

**Highlights:** Guided breathing exercises, Customizable phase durations, Ambient sound library, Daily reminder notifications, Distraction-free interface, Haptic feedback

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Account / Month | $2.99 | per month |
| Premium Account / Year | $9.99 | per year |


### Heed

[App page](https://appshunter.io/ios/app/heed-att-attention-training/id6789617915)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Annual | $19.99 | per year |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Physiological Sigh free?

Physiological Sigh is free to download, with in-app purchases available.

### Is Heed free?

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

### Do Physiological Sigh or Heed have ads?

Neither Physiological Sigh nor Heed shows ads.

### Which is updated more often, Physiological Sigh or Heed?

Physiological Sigh ships an update every 3 days, and Heed every 3 days. Most recently, Physiological Sigh was updated on October 11, 2026 and Heed on October 3, 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.*