# O vs Fitting O

The clearest difference is rating: Fitting O at 5.0 against O's 3.8. Fitting O also leads on review sentiment (100% vs 83%). O's advantage is ratings volume (5 vs 1) and iOS requirement (12.1 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Fitting O holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: O has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of O's written reviews are positive against 100% of Fitting O's.

## The numbers

| Metric | O | Fitting O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (5 ratings)](https://appshunter.io/ios/app/o-ring/id485346224/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fitting-o-ring-finder/id1557789899/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | Free |
| Size | 26 MB | 181 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Anson Thurston](https://appshunter.io/developer/1557789901) |

## What reviewers say

### O

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

This app helps users calculate O-Ring dimensions and find compatible materials for their applications. It provides recommendations based on ISO standards and supports both metric and inch measurements.

**Highlights:** O-Ring housing calculation, O-Ring size recommendations by ISO standard, Quick search by national/international standards, O-Ring tolerance calculation, Metric and inch unit switching, Chemical compatibility check, Integration of Trelleborg Sealing Solutions Videos

**Features:** macOS Compatibility

**In-app purchases:** none


### Fitting O

[App page](https://appshunter.io/ios/app/fitting-o-ring-finder/id1557789899)

Easily identify the correct O-ring for various hydraulic fitting types. Select your fitting style, and the app provides details, common sizes, and specific O-ring information to help you find the right part.

**Highlights:** Hydraulic fitting type selection, Common O-ring size listing, Detailed O-ring information, Supports US Dash and Metric sizes, Covers Flange, O-Ring Face, and more

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Fitting O free?

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

### Which has better reviews, O or Fitting O?

Fitting O is rated higher. O averages 3.8 out of 5 from 5 ratings, while Fitting O averages 5.0 from 1 ratings.

### Do O or Fitting O have ads?

Neither O nor Fitting O shows ads.

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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.*