# Fitting O vs ESCO® Track Pro v4

Fitting O and ESCO® Track Pro v4 are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | Fitting O | ESCO® Track Pro v4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fitting-o-ring-finder/id1557789899/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Monetization | Free | — |
| Size | 181 MB | 49 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anson Thurston](https://appshunter.io/developer/1557789901) | [ESCO Corporation](https://appshunter.io/developer/1050531756) |

## What reviewers say

### 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


### ESCO® Track Pro v4

[App page](https://appshunter.io/ios/app/esco-track-pro-v4/id6468638591)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fitting O free?

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

### Is ESCO® Track Pro v4 free?

ESCO® Track Pro v4 is free to download, with no in-app purchases.

### Do Fitting O or ESCO® Track Pro v4 have ads?

Neither Fitting O nor ESCO® Track Pro v4 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.*