# Izoler Pro vs Duct Calculator Pro

The clearest difference is price: Duct Calculator Pro at $3.99 against Izoler Pro's $33.99. Izoler Pro's advantage is update cadence (every 5 weeks vs every 72 months) and iOS requirement (8.0 vs 18.5). On ads, in-app purchases, monetization model and device support there is nothing between them.

Izoler Pro costs $33.99 and Duct Calculator Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Izoler Pro ships an update every 5 weeks, Duct Calculator Pro every 72 months. The most recent releases landed on October 5, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Izoler Pro | Duct Calculator Pro |
| --- | --- | --- |
| Price | $33.99 | **$3.99** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 72 months |
| Monetization | Paid | Paid |
| Size | 24 MB | 1 MB |
| Requires iOS | **8.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Rafal Grobelny](https://appshunter.io/developer/1023229430) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### Izoler Pro

[App page](https://appshunter.io/ios/app/izoler-pro/id1023485776)

This application provides essential shapes for professionals in the plastics, metals, and insulation industries. It serves as a digital tool for design and manufacturing processes.

**Highlights:** Shapes for plastics industry, Shapes for metals industry, Shapes for insulation industry, Digital design tool

**Features:** Vision Pro support

**In-app purchases:** none


### Duct Calculator Pro

[App page](https://appshunter.io/ios/app/duct-calculator-pro/id1492222891)

This tool assists HVAC professionals and students with quick and precise calculations for duct sizing, airflow velocity, and airflow rate. It works offline and features a user-friendly interface for efficient project work.

**Highlights:** Duct size calculation, Airflow velocity (FPM) calculation, Airflow rate (CFM) calculation, Rectangular and round duct support, Offline functionality, Ad-free experience

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

**In-app purchases:** none


## Frequently asked questions

### Is Izoler Pro free?

Izoler Pro costs $33.99, with no in-app purchases.

### Is Duct Calculator Pro free?

Duct Calculator Pro costs $3.99, with no in-app purchases.

### Do Izoler Pro or Duct Calculator Pro have ads?

Neither Izoler Pro nor Duct Calculator Pro shows ads.

### Which is updated more often, Izoler Pro or Duct Calculator Pro?

Izoler Pro ships an update every 5 weeks, and Duct Calculator Pro every 72 months. Most recently, Izoler Pro was updated on October 5, 2026 and Duct Calculator Pro on October 25, 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.*