# Psychrometer °F vs Ductulator

The clearest difference is price: Psychrometer °F at Free against Ductulator's $3.99. Psychrometer °F also leads on review sentiment (67% vs 50%). Ductulator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On ratings volume, device support and iOS requirement there is nothing between them.

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

Ductulator holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 133 and 362 respectively. Written reviews complicate that: 67% of Psychrometer °F'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.

Psychrometer °F ships an update every 5 months, Ductulator every 2 months. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Psychrometer °F | Ductulator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.5 (133 ratings)](https://appshunter.io/ios/app/psychrometer-f/id650395794/reviews) | **[4.7 (362 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 133 | **362** |
| Positive reviews | **66.7% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Ad-supported | **Free** |
| Best chart rank | — | **#61** |
| Size | 9 MB | 1 MB |
| Requires iOS | 18.6 | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [JUN KANAYAMA](https://appshunter.io/developer/605648452) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### Psychrometer °F

[App page](https://appshunter.io/ios/app/psychrometer-f/id650395794)

This app calculates thermal comfort by evaluating heat, cold, dryness, and moisture. It provides detailed air property calculations and indicates if conditions are within a comfortable range, with easy dial input and color-coded temperature.

**Highlights:** Thermal comfort calculation, Air property analysis, Color-coded temperature, Dial input, Outdoor weather integration, Psychrometer type selection

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


### Ductulator

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

**Currently charting:** #61 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 Psychrometer °F free?

Psychrometer °F 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, Psychrometer °F or Ductulator?

Ductulator is rated higher. Psychrometer °F averages 4.5 out of 5 from 133 ratings, while Ductulator averages 4.7 from 362 ratings.

### Do Psychrometer °F or Ductulator have ads?

Psychrometer °F shows ads; Ductulator does not.

### Which is updated more often, Psychrometer °F or Ductulator?

Psychrometer °F ships an update every 5 months, and Ductulator every 2 months. Most recently, Psychrometer °F was updated on November 6, 2026 and Ductulator on November 11, 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.*