# O vs XQR Scan

The clearest difference is in-app purchases: O at none against XQR Scan's 3. O also leads on ads (none vs shown). XQR Scan's advantage is update cadence (every 10 days vs every 11 months) and iOS requirement (13.0 vs 16.0). On price and device support there is nothing between them.

Both are free to download. XQR Scan sells 3 in-app purchases, starting at $4.99 per 7 days. O asks for nothing beyond the download.

O ships an update every 11 months, XQR Scan every 10 days. The most recent releases landed on September 26, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | O | XQR Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 47 MB | 25 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) | [IINTERGO PTE. LTD.](https://appshunter.io/developer/1703199328) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring-master/id1072051820)

This app provides a comprehensive offline tool for selecting standard rubber seal sizes, including O-Rings, X-Rings, and Back-Up Rings. It offers dimension searches, housing calculations for various sealing applications, and supports multiple international standards in both metric and imperial units.

**Highlights:** Offline standard rubber seal size selection, Search for O-Ring, X-Ring, and Back-Up Ring sizes, O-Ring housing calculations for sealing applications, Supports multiple international standards (AS568, METRIC, JIS, etc.), Metric and Imperial unit support, Substitutable O-Ring size suggestions

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

**In-app purchases:** none


### XQR Scan

[App page](https://appshunter.io/ios/app/xqr-scan-qr-code-reader/id6470271226)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $4.99 | per 7 days |
| Weekly VIP | $4.99 | per 7 days |
| Yearly VIP | $49.99 | per year |


## Frequently asked questions

### Is O free?

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

### Is XQR Scan free?

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

### Do O or XQR Scan have ads?

XQR Scan shows ads; O does not.

### Which is updated more often, O or XQR Scan?

O ships an update every 11 months, and XQR Scan every 10 days. Most recently, O was updated on September 26, 2026 and XQR Scan on October 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.*