# HVAC ToolKit vs Pipe Diameter Calculators

The clearest difference is price: Pipe Diameter Calculators at Free against HVAC ToolKit's $9.99. HVAC ToolKit's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 20 months). On ads and device support there is nothing between them.

Pipe Diameter Calculators is free to download; HVAC ToolKit costs $9.99 up front. Pipe Diameter Calculators sells 1 one-off in-app purchase. HVAC ToolKit asks for nothing beyond the download.

HVAC ToolKit ships an update every 3 months, Pipe Diameter Calculators every 20 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | HVAC ToolKit | Pipe Diameter Calculators |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/hvac-toolkit/id1623246775/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 20 months |
| Monetization | Paid | — |
| Size | 60 MB | 59 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mohamad Jaber](https://appshunter.io/developer/1623246777) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## What reviewers say

### HVAC ToolKit

[App page](https://appshunter.io/ios/app/hvac-toolkit/id1623246775)

This application provides HVAC engineers with tools for design checks and quick calculations. It offers various calculators for ducting friction, pipe sizing, ventilation, and heat load estimations, with clear instructions and formulas. Users can switch between metric and imperial units, and English or Arabic languages.

**Highlights:** Friction loss calculations, Pipe sizing tools, Ventilation and pressurization calculators, Heat load and pump head estimations, Metric/Imperial unit support, English/Arabic language options

**Features:** macOS Compatibility

**In-app purchases:** none


### Pipe Diameter Calculators

[App page](https://appshunter.io/ios/app/pipe-diameter-calculators/id6743020859)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is HVAC ToolKit free?

HVAC ToolKit costs $9.99, with no in-app purchases.

### Is Pipe Diameter Calculators free?

Pipe Diameter Calculators is free to download, with in-app purchases available.

### Do HVAC ToolKit or Pipe Diameter Calculators have ads?

Neither HVAC ToolKit nor Pipe Diameter Calculators shows ads.

### Which is updated more often, HVAC ToolKit or Pipe Diameter Calculators?

HVAC ToolKit ships an update every 3 months, and Pipe Diameter Calculators every 20 months. Most recently, HVAC ToolKit was updated on November 3, 2026 and Pipe Diameter Calculators on November 3, 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.*