# Friedrich vs Ductulator

Friedrich and Ductulator both sit at 4.6 stars, but that hides the real split: 75% of Ductulator's written reviews are positive against 0% of Friedrich's. Friedrich's advantage is in-app purchases (none vs 2) and update cadence (monthly vs every 8 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Ductulator sells 2 in-app purchases, starting at $4.99 per month. Friedrich asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Friedrich against 4.5 for Ductulator. Both are backed by a comparable volume of ratings — 56 and 36 respectively. Written reviews are what separate them: 0% of Friedrich's written reviews are positive against 75% of Ductulator's.

Friedrich ships an update monthly, Ductulator every 8 months. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Friedrich | Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (56 ratings)](https://appshunter.io/ios/app/friedrich/id6460458596/reviews)** | [4.5 (36 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews) |
| Number of ratings | **56** | 36 |
| Positive reviews | 0.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 8 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 120 MB | 42 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Rheem Manufacturing Company](https://appshunter.io/developer/853793269) | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) |

## What reviewers say

### Friedrich

[App page](https://appshunter.io/ios/app/friedrich/id6460458596)

This app simplifies HVAC system installation, service, and troubleshooting for contractors. It offers Bluetooth connectivity for setup, diagnostics, and access to technical support resources like manuals and parts lists. Track warranty information and research rebates and financing options.

**Highlights:** Bluetooth setup for HVAC systems, Remote monitoring of operating parameters, Alarm diagnosis and history, Access to installation instructions and manuals, Parts list search, Warranty tracking and certificate sharing, Rebate and financing research

**Features:** Vision Pro support

**In-app purchases:** none


### 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 Friedrich free?

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

### Is Ductulator free?

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

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

Friedrich is rated higher. Friedrich averages 4.6 out of 5 from 56 ratings, while Ductulator averages 4.5 from 36 ratings.

### Do Friedrich or Ductulator have ads?

Neither Friedrich nor Ductulator shows ads.

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

Friedrich ships an update monthly, and Ductulator every 8 months. Most recently, Friedrich was updated on November 6, 2026 and Ductulator on November 9, 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.*