# HVAC Pipe Sizer vs Xylem X

The clearest difference is price: Xylem X at Free against HVAC Pipe Sizer's $6.99. Xylem X also leads on in-app purchases (none vs 1) and update cadence (every 4 months vs every 9 months). On ads and device support there is nothing between them.

Xylem X is free to download; HVAC Pipe Sizer costs $6.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase. Xylem X asks for nothing beyond the download.

HVAC Pipe Sizer ships an update every 9 months, Xylem X every 4 months. The most recent releases landed on October 27, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | Xylem X |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/xylem-x/id6449676022/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 59 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Xylem Inc.](https://appshunter.io/developer/582035368) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-steam/id336112747)

Quickly size steam pipe systems by inputting piping and steam properties. Includes a steam table calculator and HVAC equipment locator. Supports English and metric units.

**Highlights:** Steam pipe sizing, Steam table calculator, HVAC Equipment Locator, English/metric unit selection, Pipe fitting database, Slider controls for input

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Xylem X

[App page](https://appshunter.io/ios/app/xylem-x/id6449676022)

This app enables remote control and monitoring of Hydrovar X products. Users can add devices, perform commissioning, gather operational data, and receive alerts. It also facilitates sharing configuration reports and updating device firmware.

**Highlights:** Add and group connected units, Remote monitoring and control, Gather alarms and errors, Create configuration reports, Perform firmware updates

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $6.99, and also offers in-app purchases.

### Is Xylem X free?

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

### Do HVAC Pipe Sizer or Xylem X have ads?

Neither HVAC Pipe Sizer nor Xylem X shows ads.

### Which is updated more often, HVAC Pipe Sizer or Xylem X?

HVAC Pipe Sizer ships an update every 9 months, and Xylem X every 4 months. Most recently, HVAC Pipe Sizer was updated on October 27, 2026 and Xylem X on October 4, 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.*