# HVAC Psychrometric Plus vs Pipe Sizer

The clearest difference is rating: Pipe Sizer at 4.8 against HVAC Psychrometric Plus's 3.0. Pipe Sizer also leads on in-app purchases (none vs 1) and review sentiment (100% vs 73%). HVAC Psychrometric Plus's advantage is price ($6.99 vs $12.99) and update cadence (every 6 months vs every 17 months). On ads, monetization model, device support and iOS requirement there is nothing between them.

HVAC Psychrometric Plus costs $6.99 and Pipe Sizer $12.99 up front. HVAC Psychrometric Plus sells 1 one-off in-app purchase. Pipe Sizer asks for nothing beyond the download.

Pipe Sizer holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Pipe Sizer has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 73% of HVAC Psychrometric Plus's written reviews are positive against 100% of Pipe Sizer's.

HVAC Psychrometric Plus ships an update every 6 months, Pipe Sizer every 17 months. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | HVAC Psychrometric Plus | Pipe Sizer |
| --- | --- | --- |
| Price | **$6.99** | $12.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031/reviews) | **[4.8 (10 ratings)](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381/reviews)** |
| Number of ratings | 2 | **10** |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 17 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 2 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Pheinex, LLC](https://appshunter.io/developer/996932317) |

## What reviewers say

### HVAC Psychrometric Plus

[App page](https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031)

Perform single-state and mixed-air psychrometric calculations quickly and easily. Select input parameters and view updated results on a single screen. Supports 23 input combinations and offers email/spreadsheet export.

**Highlights:** Single-state psychrometric calculations, Mixed-air psychrometric calculations, 23 input parameter combinations, Real-time result updates, Universal app for iPhone and iPad, Email and spreadsheet export

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

**In-app purchases (1)**

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


### Pipe Sizer

[App page](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381)

This app helps water piping system engineers and designers quickly and accurately design and analyze piping systems. It offers direct input for flow, friction, or velocity, with live calculation updates and support for various units and pipe materials.

**Highlights:** Quickly size new piping systems, Analyze existing piping systems, Direct input for flow, friction, or velocity, Live calculation updates, Supports SI and IP units, Works with steel, copper, and PVC pipes, Includes fluid data for water and glycols

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Psychrometric Plus free?

HVAC Psychrometric Plus costs $6.99, and also offers in-app purchases.

### Is Pipe Sizer free?

Pipe Sizer costs $12.99, with no in-app purchases.

### Which has better reviews, HVAC Psychrometric Plus or Pipe Sizer?

Pipe Sizer is rated higher. HVAC Psychrometric Plus averages 3.0 out of 5 from 2 ratings, while Pipe Sizer averages 4.8 from 10 ratings.

### Do HVAC Psychrometric Plus or Pipe Sizer have ads?

Neither HVAC Psychrometric Plus nor Pipe Sizer shows ads.

### Which is updated more often, HVAC Psychrometric Plus or Pipe Sizer?

HVAC Psychrometric Plus ships an update every 6 months, and Pipe Sizer every 17 months. Most recently, HVAC Psychrometric Plus was updated on October 27, 2026 and Pipe Sizer on October 7, 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.*