# Ductulator vs UnitNote

The clearest difference is in-app purchases: UnitNote at none against Ductulator's 2. Ductulator's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Ductulator sells 2 in-app purchases, starting at $3.99 per 7 days. UnitNote asks for nothing beyond the download.

Ductulator ships an update every 8 days, UnitNote fortnightly. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Ductulator | UnitNote |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 51 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Foster Apps LLC](https://appshunter.io/developer/1836663142) | [SOON HUH](https://appshunter.io/developer/6795952120) |

## What reviewers say

### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $3.99 | per 7 days |
| Pro Yearly | $19.99 | per year |


### UnitNote

[App page](https://appshunter.io/ios/app/unitnote-conversor/id6795952118)

This tool simplifies unit conversions for everyday and professional needs. Customize your home screen with unit cards, perform quick calculations with a numeric keypad and formula input, and compare values across different units in a workspace. It supports a wide range of units and offers multiple themes and languages.

**Highlights:** Customizable home screen with unit cards, Numeric keypad and formula input, Intuitive unit selection and card arrangement, Workspace for comparing multiple unit conversions, Support for diverse units (length, area, volume, etc.), Favorites and recent history, Multiple themes and languages

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

**In-app purchases:** none


## Frequently asked questions

### Is Ductulator free?

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

### Is UnitNote free?

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

### Do Ductulator or UnitNote have ads?

Neither Ductulator nor UnitNote shows ads.

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

Ductulator ships an update every 8 days, and UnitNote fortnightly. Most recently, Ductulator was updated on October 14, 2026 and UnitNote on October 20, 2026.

---

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