# Underwave Training vs Inner Island

The clearest difference is in-app purchases: Underwave Training at none against Inner Island's 1. Underwave Training also leads on iOS requirement (13.0 vs 15.1). Inner Island's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Inner Island sells 1 in-app purchase, starting at $0.99 per month. Underwave Training asks for nothing beyond the download.

Underwave Training ships an update every 3 weeks, Inner Island every 4 days. The most recent releases landed on September 19, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Underwave Training | Inner Island |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 30 MB | 277 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Augusto Carrara](https://appshunter.io/developer/1708869023) | [Niv Rakocz](https://appshunter.io/developer/1849943446) |

## What reviewers say

### Underwave Training

[App page](https://appshunter.io/ios/app/underwave-training/id6467622177)

**Features:** macOS Compatibility

**In-app purchases:** none


### Inner Island

[App page](https://appshunter.io/ios/app/inner-island/id6754769764)

This app offers a simple, guided breathing practice designed to promote relaxation and inner calm. It uses an extended exhale technique and visualizes your progress as your personal island grows with each completed session. Unlock new content and enjoy ambient soundscapes for a deeper sense of peace.

**Highlights:** Simple breathing timer, Visual island growth, Unlock new chapters and visuals, Ambient soundscapes, CBT-based relaxation method

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Inner Island Premium | $0.99 | per month |


## Frequently asked questions

### Is Underwave Training free?

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

### Is Inner Island free?

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

### Do Underwave Training or Inner Island have ads?

Neither Underwave Training nor Inner Island shows ads.

### Which is updated more often, Underwave Training or Inner Island?

Underwave Training ships an update every 3 weeks, and Inner Island every 4 days. Most recently, Underwave Training was updated on September 19, 2026 and Inner Island on October 2, 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.*