# FocusIsle vs Underlairs

The clearest difference is update cadence: FocusIsle at every 5 days against Underlairs's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FocusIsle sells 1 one-off in-app purchase and Underlairs sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

FocusIsle ships an update every 5 days, Underlairs every 3 weeks. The most recent releases landed on September 11, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | FocusIsle | Underlairs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/underlairs-focus-study-timer/id6755931983/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | — | Freemium |
| Size | 97 MB | 230 MB |
| Requires iOS | 16.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [FindFire, Inc.](https://appshunter.io/developer/1707820732) | [John Jang](https://appshunter.io/developer/1857417631) |

## What reviewers say

### FocusIsle

[App page](https://appshunter.io/ios/app/focusisle-deep-work-sounds/id6478543801)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $3.99 | one-time |


### Underlairs

[App page](https://appshunter.io/ios/app/underlairs-focus-study-timer/id6755931983)

Enhance concentration and memory with curated ambient soundscapes and a focus timer. Choose from unique 'Lairs' and track your progress to achieve deep work and productivity goals.

**Highlights:** Focus Timer with customizable durations, Beast Mode for continuous music, Ambient soundscape playlists, Background playback, Lock screen controls, Stats tracking for focus minutes and streaks, Minimalist design

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Yearly Premium | $9.99 | per year |
| Premium Lifetime Access | $17.99 | one-time |


## Frequently asked questions

### Is FocusIsle free?

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

### Is Underlairs free?

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

### Do FocusIsle or Underlairs have ads?

Neither FocusIsle nor Underlairs shows ads.

### Which is updated more often, FocusIsle or Underlairs?

FocusIsle ships an update every 5 days, and Underlairs every 3 weeks. Most recently, FocusIsle was updated on September 11, 2026 and Underlairs on September 23, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*