# O vs LIVENESS Rooms

The clearest difference is update cadence: LIVENESS Rooms at every 3 weeks against O's every 3 months. LIVENESS Rooms also leads on iOS requirement (10.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

O ships an update every 3 months, LIVENESS Rooms every 3 weeks. Both last shipped on November 2, 2026.

## The numbers

| Metric | O | LIVENESS Rooms |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (5 ratings)](https://appshunter.io/ios/app/o-ring/id485346224/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 35 MB | 8 MB |
| Requires iOS | 26.0 | **10.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [liveness,Inc.](https://appshunter.io/developer/1245081147) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring/id485346224)

This app helps users calculate O-ring dimensions and find suitable O-ring sizes based on installation specifications. It supports metric and inch measurements and offers chemical compatibility checks for various media.

**Highlights:** O-Ring housing calculation, O-Ring size recommendation, Quick search by international standards, Tolerance calculation, Metric and inch unit switching, Chemical compatibility check

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

**In-app purchases:** none


### LIVENESS Rooms

[App page](https://appshunter.io/ios/app/liveness-rooms/id1245081148)

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is LIVENESS Rooms free?

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

### Do O or LIVENESS Rooms have ads?

Neither O nor LIVENESS Rooms shows ads.

### Which is updated more often, O or LIVENESS Rooms?

O ships an update every 3 months, and LIVENESS Rooms every 3 weeks. Most recently, O was updated on November 2, 2026 and LIVENESS Rooms on November 2, 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.*