# Atteno vs Only Three

The clearest difference is in-app purchases: Only Three at none against Atteno's 1. Only Three also leads on update cadence (every 2 weeks vs every 4 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Atteno sells 1 one-off in-app purchase. Only Three asks for nothing beyond the download.

Atteno ships an update every 4 weeks, Only Three every 2 weeks. The most recent releases landed on September 13, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Atteno | Only Three |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 2 weeks** |
| Size | 35 MB | 32 MB |
| Requires iOS | 16.1 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [子文 杨](https://appshunter.io/developer/1804228519) | [Alan Pooley](https://appshunter.io/developer/1889392820) |

## What reviewers say

### Atteno

[App page](https://appshunter.io/ios/app/atteno-focus-timer-and-study/id6757382433)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atteno Pro Lifetime | $4.99 | one-time |


### Only Three

[App page](https://appshunter.io/ios/app/only-three/id6761401681)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Atteno free?

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

### Is Only Three free?

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

### Do Atteno or Only Three have ads?

Neither Atteno nor Only Three shows ads.

### Which is updated more often, Atteno or Only Three?

Atteno ships an update every 4 weeks, and Only Three every 2 weeks. Most recently, Atteno was updated on September 13, 2026 and Only Three on September 10, 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.*