# Leak Calculator vs O

The clearest difference is device support: Leak Calculator at 3 against O's 1. Leak Calculator also leads on iOS requirement (6.0 vs 16.0). On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Leak Calculator against 5.0 for O. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Leak Calculator ships an update every 18 months, O every 11 months. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Leak Calculator | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/leak-calculator/id682051197/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 11 months** |
| Monetization | Free | Free |
| Size | 5 MB | 47 MB |
| Requires iOS | **6.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Uson L.P.](https://appshunter.io/developer/682051200) | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) |

## What reviewers say

### Leak Calculator

[App page](https://appshunter.io/ios/app/leak-calculator/id682051197)

Estimate production rates and cycle times for leak testing with this pocket-sized tool. It offers multiple calculation options and unit conversions, serving as a valuable resource for professionals in the field.

**Highlights:** Solve for Total Cycle Time, Solve Part Volume, Solve Leak Rate, Solve for Expected Pressure Change, Solve for Test Time, Pressure Decay Cycle Time, Unit Converters

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Leak Calculator free?

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

### Is O free?

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

### Which has better reviews, Leak Calculator or O?

Leak Calculator and O are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Leak Calculator or O have ads?

Neither Leak Calculator nor O shows ads.

### Which is updated more often, Leak Calculator or O?

Leak Calculator ships an update every 18 months, and O every 11 months. Most recently, Leak Calculator was updated on October 28, 2026 and O on October 24, 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.*