# O vs Barcode Reader

The clearest difference is rating: O at 5.0 against Barcode Reader's 3.0. O also leads on ads (none vs shown). Barcode Reader's advantage is iOS requirement (7.1 vs 16.0). On price, review sentiment, ratings volume 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.

O holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

## The numbers

| Metric | O | Barcode Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/barcode-reader-free/id1081650822/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | — |
| Monetization | Free | Free |
| Size | 47 MB | 6 MB |
| Requires iOS | 16.0 | **7.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) | [Aishvarya Sadasivam](https://appshunter.io/developer/1062048241) |

## 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


### Barcode Reader

[App page](https://appshunter.io/ios/app/barcode-reader-free/id1081650822)

Scan barcodes using your iPhone camera to quickly find product prices from online retailers. It also helps you easily reorder household or business items by scanning existing products.

**Highlights:** Scan barcodes with iPhone camera, Compare product prices online, Easily reorder items, Scan from camera roll, Save scan history, Export scan data to CSV, Bulk scanning mode

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

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Barcode Reader free?

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

### Which has better reviews, O or Barcode Reader?

O is rated higher. O averages 5.0 out of 5 from 1 ratings, while Barcode Reader averages 3.0 from 2 ratings.

### Do O or Barcode Reader have ads?

Barcode Reader shows ads; O does not.

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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.*