# Ductulator vs Duct Sizer Calc HVAC

The clearest difference is price: Ductulator at Free against Duct Sizer Calc HVAC's $0.99. Duct Sizer Calc HVAC's advantage is update cadence (every 3 weeks vs every 8 months) and iOS requirement (13.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Ductulator is free to download; Duct Sizer Calc HVAC costs $0.99 up front. Ductulator sells 2 in-app purchases, starting at $4.99 per month and Duct Sizer Calc HVAC sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Ductulator ships an update every 8 months, Duct Sizer Calc HVAC every 3 weeks. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Ductulator | Duct Sizer Calc HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.5 (36 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 34 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### 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 |


### Duct Sizer Calc HVAC

[App page](https://appshunter.io/ios/app/duct-sizer-calc-hvac/id6764646921)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Ductulator free?

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

### Is Duct Sizer Calc HVAC free?

Duct Sizer Calc HVAC costs $0.99, and also offers in-app purchases.

### Do Ductulator or Duct Sizer Calc HVAC have ads?

Neither Ductulator nor Duct Sizer Calc HVAC shows ads.

### Which is updated more often, Ductulator or Duct Sizer Calc HVAC?

Ductulator ships an update every 8 months, and Duct Sizer Calc HVAC every 3 weeks. Most recently, Ductulator was updated on November 9, 2026 and Duct Sizer Calc HVAC on November 5, 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.*