# Sleep Island vs Intervo

The clearest difference is price: Sleep Island at Free against Intervo's $0.99. Sleep Island also leads on update cadence (every 3 days vs weekly). Intervo's advantage is in-app purchases (none vs 3) and chart position (#195 vs unranked). On ads, device support and iOS requirement there is nothing between them.

Sleep Island is free to download; Intervo costs $0.99 up front. Sleep Island sells 3 in-app purchases, starting at $2.99 per month. Intervo asks for nothing beyond the download.

Sleep Island ships an update every 3 days, Intervo weekly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Sleep Island | Intervo |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (26 ratings)](https://appshunter.io/ios/app/sleep-island-tracker-and-sounds/id6747609991/reviews)** | — |
| Number of ratings | **26** | — |
| Positive reviews | 93.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Freemium | — |
| Best chart rank | — | **#195** |
| Size | 54 MB | 5 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [chaohua gao](https://appshunter.io/developer/1140400401) | [Robert Corbin](https://appshunter.io/developer/1890247992) |

## What reviewers say

### Sleep Island

[App page](https://appshunter.io/ios/app/sleep-island-tracker-and-sounds/id6747609991)

This app monitors your sleep patterns without requiring a wearable device. It offers a variety of soothing sounds, music, and podcasts to help you fall asleep, and provides detailed sleep reports upon waking. Premium features unlock full playback and advanced sound options.

**Highlights:** Wearable-free sleep monitoring, Customizable bedtime ambience, Smart sleep stage detection, Detailed morning sleep reports, Extensive sound library, Podcast integration, Immersive visual scenes

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sleep Island Premium (Monthly) | $2.99 | per month |
| Sleep Island Premium (Yearly) | $19.99 | per year |
| Lifetime Membership | $29.99 | one-time |


### Intervo

[App page](https://appshunter.io/ios/app/intervo-hiit-interval-timer/id6775499898)

**Currently charting:** #195 Top Paid · Health & Fitness (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Island free?

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

### Is Intervo free?

Intervo costs $0.99, with no in-app purchases.

### Do Sleep Island or Intervo have ads?

Neither Sleep Island nor Intervo shows ads.

### Which is updated more often, Sleep Island or Intervo?

Sleep Island ships an update every 3 days, and Intervo weekly. Most recently, Sleep Island was updated on November 8, 2026 and Intervo on November 5, 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.*