# Installer App vs DuctCalc.Ca

The clearest difference is rating: Installer App at 3.0 against DuctCalc.Ca's 1.9. Installer App also leads on in-app purchases (none vs 4) and update cadence (every 5 weeks vs every 4 months). DuctCalc.Ca's advantage is iOS requirement (11.3 vs 15.0). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. DuctCalc.Ca sells 4 one-off in-app purchases. Installer App asks for nothing beyond the download.

Installer App holds the better App Store score, 3.0 against 1.9. Both are backed by a comparable volume of ratings — 7 and 20 respectively. Written reviews point the same way: 53% of Installer App's written reviews are positive against 50% of DuctCalc.Ca's.

Installer App ships an update every 5 weeks, DuctCalc.Ca every 4 months. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Installer App | DuctCalc.Ca |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (7 ratings)](https://appshunter.io/ios/app/installer-app/id423984641/reviews)** | [1.9 (20 ratings)](https://appshunter.io/ios/app/ductcalcca/id1434460375/reviews) |
| Number of ratings | 7 | **20** |
| Positive reviews | **53.3% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 90 MB | 9 MB |
| Requires iOS | 15.0 | **11.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Firas Kneifati](https://appshunter.io/developer/1434460374) |

## What reviewers say

### Installer App

[App page](https://appshunter.io/ios/app/installer-app/id423984641)

This app provides HVAC professionals with a digital toolbox for everyday tasks. It offers product information, installation guides, and advanced features to streamline work, including project management and hydronic balancing tools.

**Highlights:** Radiator Presetting, Product Finder, My Projects (Cloud-based), Hydronic Balancing, Flow/Pressure Calculator, Floor Heating Tools, Burner Converter, Magnetic Tool

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

**In-app purchases:** none


### DuctCalc.Ca

[App page](https://appshunter.io/ios/app/ductcalcca/id1434460375)

This utility app calculates duct dimensions and air velocity using two methods: Equal Friction and Velocity. It supports both round and rectangular ducts, offering precise calculations for HVAC professionals. Offline functionality is available with a subscription.

**Highlights:** Duct sizing calculator, Equal Friction Method, Velocity Method, Round and rectangular duct support, Offline functionality, Full air flow range activation

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Full Air Flow | $6.99 | one-time |
| Three Months Full Air Flow | $17.99 | one-time |
| Six Months Full Air Flow | $29.99 | one-time |
| One Year Full Air Flow | $49.99 | one-time |


## Frequently asked questions

### Is Installer App free?

Installer App is free to download, with no in-app purchases.

### Is DuctCalc.Ca free?

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

### Which has better reviews, Installer App or DuctCalc.Ca?

Installer App is rated higher. Installer App averages 3.0 out of 5 from 7 ratings, while DuctCalc.Ca averages 1.9 from 20 ratings.

### Do Installer App or DuctCalc.Ca have ads?

Neither Installer App nor DuctCalc.Ca shows ads.

### Which is updated more often, Installer App or DuctCalc.Ca?

Installer App ships an update every 5 weeks, and DuctCalc.Ca every 4 months. Most recently, Installer App was updated on October 14, 2026 and DuctCalc.Ca on October 1, 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.*