# Ductulator vs NESM Tools

The clearest difference is in-app purchases: NESM Tools at none against Ductulator's 2. NESM Tools also leads on update cadence (every 3 weeks vs every 8 months) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

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

Ductulator ships an update every 8 months, NESM Tools every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Ductulator | NESM Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (34 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews)** | — |
| Number of ratings | **34** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 50 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) | [Craig Danby](https://appshunter.io/developer/6795641237) |

## 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 |


### NESM Tools

[App page](https://appshunter.io/ios/app/nesm-tools/id6795933641)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ductulator free?

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

### Is NESM Tools free?

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

### Do Ductulator or NESM Tools have ads?

Neither Ductulator nor NESM Tools shows ads.

### Which is updated more often, Ductulator or NESM Tools?

Ductulator ships an update every 8 months, and NESM Tools every 3 weeks. Most recently, Ductulator was updated on October 24, 2026 and NESM Tools on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*