# HVAC Toolkit Ultimate vs Ductulator

The clearest difference is price: Ductulator at $3.99 against HVAC Toolkit Ultimate's $59.99. Ductulator also leads on rating (4.7 vs 3.0) and ratings volume (317 vs 4). HVAC Toolkit Ultimate's advantage is iOS requirement (13.0 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

HVAC Toolkit Ultimate costs $59.99 and Ductulator $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ductulator holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Ductulator has 317 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 40% of HVAC Toolkit Ultimate's written reviews are positive against 50% of Ductulator's.

HVAC Toolkit Ultimate ships an update every 6 months, Ductulator every 2 months. The most recent releases landed on October 12, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | HVAC Toolkit Ultimate | Ductulator |
| --- | --- | --- |
| Price | $59.99 | **$3.99** |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247/reviews) | **[4.7 (317 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 4 | **317** |
| Positive reviews | 40.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#58** |
| Size | 59 MB | 1 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### HVAC Toolkit Ultimate

[App page](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247)

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

**Highlights:** Residential load calculations, Equipment nameplate data tracking, Refrigerant pressure-temperature charts, Superheat and subcool calculations, Duct and pipe sizing analysis, Psychrometric calculations, Steam table property calculations

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

**In-app purchases:** none


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475)

**Currently charting:** #58 Top Paid · Productivity (US App Store)

Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.

**Highlights:** Instant duct sizing, Friction rate or velocity calculation, Multiple valid duct dimensions, IP and SI units support, Detailed sizing mode, Rectangular, circular, and flexible ducts

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

**In-app purchases:** none

**What reviewers like**

- 👍 Very helpful for duct sizing
- 👍 Easy to use in the field
- 👍 Saves time
- 👍 Seamless imperial/metric transitions
- 👍 Excellent tool for duct design

**What reviewers complain about**

- 👎 App should be free
- 👎 Functionality is pointless for some needs
- 👎 Doesn't help with traditional residential HVAC duct sizing
- 👎 App is a scam
- 👎 Decimal point doesn't work

**Reported bugs**

- Decimal point doesn't work on calculator
- New flex option isn't working properly
- Friction rate can't be changed in the latest version
- Skips duct sizes (e.g., 24-26)

**Requested features**

- Ability to pick duct size and see CFM
- Include flat oval ducts
- Option to select round or square duct
- Ability to enter duct size and get CFM
- Option for flex duct


## Frequently asked questions

### Is HVAC Toolkit Ultimate free?

HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.

### Is Ductulator free?

Ductulator costs $3.99, with no in-app purchases.

### Which has better reviews, HVAC Toolkit Ultimate or Ductulator?

Ductulator is rated higher. HVAC Toolkit Ultimate averages 3.0 out of 5 from 4 ratings, while Ductulator averages 4.7 from 317 ratings.

### Do HVAC Toolkit Ultimate or Ductulator have ads?

Neither HVAC Toolkit Ultimate nor Ductulator shows ads.

### Which is updated more often, HVAC Toolkit Ultimate or Ductulator?

HVAC Toolkit Ultimate ships an update every 6 months, and Ductulator every 2 months. Most recently, HVAC Toolkit Ultimate was updated on October 12, 2026 and Ductulator on October 20, 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.*