# HVACsim vs Ductulator

The clearest difference is rating: Ductulator at 4.5 against HVACsim's 2.2. HVACsim's advantage is update cadence (every 2 months vs every 8 months) and iOS requirement (13.4 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. HVACsim sells 1 one-off in-app purchase and Ductulator sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Ductulator holds the better App Store score, 4.5 against 2.2. Both are backed by a comparable volume of ratings — 13 and 34 respectively.

HVACsim ships an update every 2 months, Ductulator every 8 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | HVACsim | Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.2 (13 ratings)](https://appshunter.io/ios/app/hvacsim/id6740935191/reviews) | **[4.5 (34 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews)** |
| Number of ratings | 13 | **34** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 20 MB | 42 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nauman Innovation Group LLC](https://appshunter.io/developer/1764933586) | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) |

## What reviewers say

### HVACsim

[App page](https://appshunter.io/ios/app/hvacsim/id6740935191)

This app offers interactive learning and real-world data analysis to help HVAC professionals diagnose and troubleshoot systems. It provides personalized training plans, skill assessments, and team management tools for contractors.

**Highlights:** Technical Knowledge Evaluator, Individualized Learning Plans, Real-World Data Analysis, Team Management Tools, Continuous Learning Library

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $29.99 | one-time |


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937)

This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.

**Highlights:** Duct sizing for round, rectangular, and flexible ducts, Fittings pressure drop calculation, Psychrometric analysis with interactive chart, Supports Imperial and Metric units, Pre-configured velocity limits for application types, Real-time validation warnings

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium | $4.99 | per month |
| premium | $29.99 | per year |


## Frequently asked questions

### Is HVACsim free?

HVACsim is free to download, with in-app purchases available.

### Is Ductulator free?

Ductulator is free to download, with in-app purchases available.

### Which has better reviews, HVACsim or Ductulator?

Ductulator is rated higher. HVACsim averages 2.2 out of 5 from 13 ratings, while Ductulator averages 4.5 from 34 ratings.

### Do HVACsim or Ductulator have ads?

Neither HVACsim nor Ductulator shows ads.

### Which is updated more often, HVACsim or Ductulator?

HVACsim ships an update every 2 months, and Ductulator every 8 months. Most recently, HVACsim was updated on October 24, 2026 and Ductulator on October 24, 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.*