# HVAC PT Chart vs Ductulator

The clearest difference is price: HVAC PT Chart at Free against Ductulator's $3.99. HVAC PT Chart also leads on iOS requirement (13.1 vs 18.6). Ductulator's advantage is rating (4.7 vs 4.0) and in-app purchases (none vs 1). On review sentiment, ads, monetization model and device support there is nothing between them.

HVAC PT Chart is free to download; Ductulator costs $3.99 up front. HVAC PT Chart sells 1 one-off in-app purchase. Ductulator asks for nothing beyond the download.

Ductulator holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Ductulator has 353 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 56% of HVAC PT Chart's written reviews are positive against 50% of Ductulator's, so the app with the better star average is not the one people write more warmly about.

HVAC PT Chart ships an update every 4 months, Ductulator every 2 months. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | HVAC PT Chart | Ductulator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.0 (8 ratings)](https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews) | **[4.7 (353 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 8 | **353** |
| Positive reviews | **55.6% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Best chart rank | — | **#32** |
| Size | 27 MB | 1 MB |
| Requires iOS | **13.1** | 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 PT Chart

[App page](https://appshunter.io/ios/app/hvac-pt-chart/id508212589)

This tool provides HVAC technicians with instant access to pressure and temperature data for over 100 refrigerants. It allows users to input one value to find the other, view detailed refrigerant properties, and email comprehensive charts and data.

**Highlights:** Pressure/temperature lookup for 100+ refrigerants, Input temperature to find pressure, or vice versa, Slider control for precise value selection, Email complete PT chart lists and refrigerant properties, Display common refrigerant properties, Adjust for atmospheric pressure based on city elevation, English and Metric unit options

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

**In-app purchases (1)**

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


### Ductulator

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

**Currently charting:** #32 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 PT Chart free?

HVAC PT Chart is free to download, with in-app purchases available.

### Is Ductulator free?

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

### Which has better reviews, HVAC PT Chart or Ductulator?

Ductulator is rated higher. HVAC PT Chart averages 4.0 out of 5 from 8 ratings, while Ductulator averages 4.7 from 353 ratings.

### Do HVAC PT Chart or Ductulator have ads?

Neither HVAC PT Chart nor Ductulator shows ads.

### Which is updated more often, HVAC PT Chart or Ductulator?

HVAC PT Chart ships an update every 4 months, and Ductulator every 2 months. Most recently, HVAC PT Chart was updated on October 27, 2026 and Ductulator on October 26, 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.*