# WellO2 vs Allas

The clearest difference is update cadence: Allas at every 3 weeks against WellO2's every 6 weeks. WellO2's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

WellO2 ships an update every 6 weeks, Allas every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | WellO2 | Allas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 54 MB | 58 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [WellO2 Oy](https://appshunter.io/developer/1621277574) | [Nordic Urban Oy](https://appshunter.io/developer/1775409310) |

## What reviewers say

### WellO2

[App page](https://appshunter.io/ios/app/wello2/id1621277572)

**In-app purchases:** none


### Allas

[App page](https://appshunter.io/ios/app/allas/id6737230349)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is WellO2 free?

WellO2 is free to download, with no in-app purchases.

### Is Allas free?

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

### Do WellO2 or Allas have ads?

Neither WellO2 nor Allas shows ads.

### Which is updated more often, WellO2 or Allas?

WellO2 ships an update every 6 weeks, and Allas every 3 weeks. Most recently, WellO2 was updated on November 3, 2026 and Allas on November 4, 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.*