# 03 vs Physiological Sigh

The clearest difference is update cadence: Physiological Sigh at every 3 days against 03's weekly. 03's advantage is iOS requirement (18.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 03 sells 1 one-off in-app purchase and Physiological Sigh sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

03 ships an update weekly, Physiological Sigh every 3 days. The most recent releases landed on October 7, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | 03 | Physiological Sigh |
| --- | --- | --- |
| 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 | Weekly | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 43 MB |
| Requires iOS | **18.0** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Cagla Akgul Gurgur](https://appshunter.io/developer/1883984771) | [emmanuel orvain](https://appshunter.io/developer/1025308595) |

## What reviewers say

### 03

[App page](https://appshunter.io/ios/app/0317-stop-overthinking/id6760342606)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access | $2.99 | one-time |


### 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 |


## Frequently asked questions

### Is 03 free?

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

### Is Physiological Sigh free?

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

### Do 03 or Physiological Sigh have ads?

Neither 03 nor Physiological Sigh shows ads.

### Which is updated more often, 03 or Physiological Sigh?

03 ships an update weekly, and Physiological Sigh every 3 days. Most recently, 03 was updated on October 7, 2026 and Physiological Sigh 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.*