# Volume in Pipe vs eWCAT

The clearest difference is update cadence: eWCAT at every 3 weeks against Volume in Pipe's every 26 months. eWCAT also leads on device support (3 vs 1) and iOS requirement (9.0 vs 16.6). On price, ads 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.

Volume in Pipe ships an update every 26 months, eWCAT every 3 weeks. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Volume in Pipe | eWCAT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/volume-in-pipe/id1582068096/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 11 MB | 41 MB |
| Requires iOS | 16.6 | **9.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Gayneaux](https://appshunter.io/developer/1082576429) | [Eraze Computer Software B.V.](https://appshunter.io/developer/1619076012) |

## What reviewers say

### Volume in Pipe

[App page](https://appshunter.io/ios/app/volume-in-pipe/id1582068096)

Quickly estimate the gas volume within pipes, launchers, or vessels. Input operating conditions and pipe size for an approximate volume calculation. This tool is designed for rapid field estimates.

**Highlights:** Estimate gas volume, Input operating conditions, Select pipe size, Quick field estimates, Supports iPhone

**Features:** macOS Compatibility

**In-app purchases:** none


### eWCAT

[App page](https://appshunter.io/ios/app/ewcat/id1619076010)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Volume in Pipe free?

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

### Is eWCAT free?

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

### Do Volume in Pipe or eWCAT have ads?

Neither Volume in Pipe nor eWCAT shows ads.

### Which is updated more often, Volume in Pipe or eWCAT?

Volume in Pipe ships an update every 26 months, and eWCAT every 3 weeks. Most recently, Volume in Pipe was updated on October 6, 2026 and eWCAT on October 16, 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.*