# Two Phase Separator Lite vs Volume in Pipe

The clearest difference is device support: Two Phase Separator Lite at 3 against Volume in Pipe's 1. Two Phase Separator Lite also leads on iOS requirement (11.0 vs 16.6). On price, update cadence, 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.

Two Phase Separator Lite ships an update every 35 months, Volume in Pipe every 26 months. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Two Phase Separator Lite | Volume in Pipe |
| --- | --- | --- |
| 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 35 months | **Every 26 months** |
| Monetization | — | Free |
| Size | 27 MB | 11 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ali Pourahmadi Laleh](https://appshunter.io/developer/1218620381) | [Kelly Gayneaux](https://appshunter.io/developer/1082576429) |

## What reviewers say

### Two Phase Separator Lite

[App page](https://appshunter.io/ios/app/two-phase-separator-lite/id1347623045)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Two Phase Separator Lite free?

Two Phase Separator Lite is free to download, with no in-app purchases.

### Is Volume in Pipe free?

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

### Do Two Phase Separator Lite or Volume in Pipe have ads?

Neither Two Phase Separator Lite nor Volume in Pipe shows ads.

### Which is updated more often, Two Phase Separator Lite or Volume in Pipe?

Two Phase Separator Lite ships an update every 35 months, and Volume in Pipe every 26 months. Most recently, Two Phase Separator Lite was updated on September 23, 2026 and Volume in Pipe on September 10, 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.*