# HVAC ToolKit vs Zepth

The clearest difference is price: Zepth at Free against HVAC ToolKit's $9.99. Zepth also leads on update cadence (every 2 weeks vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Zepth is free to download; HVAC ToolKit costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC ToolKit ships an update every 3 months, Zepth every 2 weeks. The most recent releases landed on September 8, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | HVAC ToolKit | Zepth |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 60 MB | 57 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mohamad Jaber](https://appshunter.io/developer/1623246777) | [Zepth](https://appshunter.io/developer/1707033579) |

## 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


### Zepth

[App page](https://appshunter.io/ios/app/zepth-manage-construction/id6748593842)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC ToolKit free?

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

### Is Zepth free?

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

### Do HVAC ToolKit or Zepth have ads?

Neither HVAC ToolKit nor Zepth shows ads.

### Which is updated more often, HVAC ToolKit or Zepth?

HVAC ToolKit ships an update every 3 months, and Zepth every 2 weeks. Most recently, HVAC ToolKit was updated on September 8, 2026 and Zepth on September 6, 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.*