# Underlairs vs TTT

The clearest difference is in-app purchases: TTT at none against Underlairs's 3. TTT also leads on update cadence (every 6 days vs every 3 weeks). Underlairs's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Underlairs sells 3 in-app purchases, starting at $0.99 per month. TTT asks for nothing beyond the download.

Underlairs ships an update every 3 weeks, TTT every 6 days. Both last shipped on October 9, 2026.

## The numbers

| Metric | Underlairs | TTT |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 230 MB | 4 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Jang](https://appshunter.io/developer/1857417631) | [Framedata](https://appshunter.io/developer/1588606840) |

## What reviewers say

### 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 |


### TTT

[App page](https://appshunter.io/ios/app/ttt-the-time-tracker/id6799625984)

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

**In-app purchases:** none


## Frequently asked questions

### Is Underlairs free?

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

### Is TTT free?

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

### Do Underlairs or TTT have ads?

Neither Underlairs nor TTT shows ads.

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

Underlairs ships an update every 3 weeks, and TTT every 6 days. Most recently, Underlairs was updated on October 9, 2026 and TTT on October 9, 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.*