# HVAC Pipe Sizer vs SKF Shaft alignment

The clearest difference is price: SKF Shaft alignment at Free against HVAC Pipe Sizer's $4.99. SKF Shaft alignment also leads on update cadence (every 3 months vs every 9 months) and ratings volume (10 vs 3). HVAC Pipe Sizer's advantage is rating (5.0 vs 3.7). On review sentiment, ads, in-app purchases and device support there is nothing between them.

SKF Shaft alignment is free to download; HVAC Pipe Sizer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC Pipe Sizer holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 10 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

HVAC Pipe Sizer ships an update every 9 months, SKF Shaft alignment every 3 months. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | SKF Shaft alignment |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523/reviews)** | [3.7 (10 ratings)](https://appshunter.io/ios/app/skf-shaft-alignment/id990162436/reviews) |
| Number of ratings | 3 | **10** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 72 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [SKF](https://appshunter.io/developer/472922971) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523)

This utility app helps engineers quickly size high-pressure gas piping systems. Input flow, pressure, and pipe properties to calculate diameters, velocity, and equivalent length. Supports English and metric units with built-in tables for various pipe materials.

**Highlights:** High-pressure gas pipe sizing, Input flow, pressure, and pipe parameters, Calculate exact/nominal diameters, Determine velocity and equivalent length, Supports English and metric units, Includes pipe fitting tables, Universal app for iPhone and iPad

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

**In-app purchases:** none


### SKF Shaft alignment

[App page](https://appshunter.io/ios/app/skf-shaft-alignment/id990162436)

This utility app, when paired with specific hardware, enables precise and intuitive shaft alignment for rotating machinery. It offers a demonstration mode for experiencing the full process without the hardware and generates automatic, shareable reports.

**Highlights:** Intuitive shaft alignment with hardware, Flexible three-position measurement, Demonstration mode for full experience, Automatic, customizable alignment reports, Explanatory setup and measurement videos, 3D animations for guidance, Machine library with QR code scanner

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $4.99, with no in-app purchases.

### Is SKF Shaft alignment free?

SKF Shaft alignment is free to download, with no in-app purchases.

### Which has better reviews, HVAC Pipe Sizer or SKF Shaft alignment?

HVAC Pipe Sizer is rated higher. HVAC Pipe Sizer averages 5.0 out of 5 from 3 ratings, while SKF Shaft alignment averages 3.7 from 10 ratings.

### Do HVAC Pipe Sizer or SKF Shaft alignment have ads?

Neither HVAC Pipe Sizer nor SKF Shaft alignment shows ads.

### Which is updated more often, HVAC Pipe Sizer or SKF Shaft alignment?

HVAC Pipe Sizer ships an update every 9 months, and SKF Shaft alignment every 3 months. Most recently, HVAC Pipe Sizer was updated on October 27, 2026 and SKF Shaft alignment on October 29, 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.*