# O2Lock vs AquaMetr

The clearest difference is iOS requirement: O2Lock at 12.0 against AquaMetr's 17.6. On price, update cadence, 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.

O2Lock ships an update every 3 weeks, AquaMetr monthly. The most recent releases landed on September 16, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | O2Lock | AquaMetr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 30 MB | 25 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [One2Touch AS](https://appshunter.io/developer/1678046395) | [SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED](https://appshunter.io/developer/1279674870) |

## What reviewers say

### O2Lock

[App page](https://appshunter.io/ios/app/o2lock/id6478984927)

**In-app purchases:** none


### AquaMetr

[App page](https://appshunter.io/ios/app/aquametr/id6741795863)

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

**In-app purchases:** none


## Frequently asked questions

### Is O2Lock free?

O2Lock is free to download, with no in-app purchases.

### Is AquaMetr free?

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

### Do O2Lock or AquaMetr have ads?

Neither O2Lock nor AquaMetr shows ads.

### Which is updated more often, O2Lock or AquaMetr?

O2Lock ships an update every 3 weeks, and AquaMetr monthly. Most recently, O2Lock was updated on September 16, 2026 and AquaMetr on September 19, 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.*