# Kwanjai Next vs DuctSizer

The clearest difference is price: Kwanjai Next at Free against DuctSizer's $4.99. DuctSizer's advantage is update cadence (every 4 days vs fortnightly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Kwanjai Next is free to download; DuctSizer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kwanjai Next ships an update fortnightly, DuctSizer every 4 days. The most recent releases landed on September 19, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Kwanjai Next | DuctSizer |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Paid |
| Size | 39 MB | 57 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [builk one group](https://appshunter.io/developer/1339053042) | [MULBERRYSOFT COMPANY LIMITED](https://appshunter.io/developer/1612779919) |

## What reviewers say

### Kwanjai Next

[App page](https://appshunter.io/ios/app/kwanjai-next/id1476012866)

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

**In-app purchases:** none


### DuctSizer

[App page](https://appshunter.io/ios/app/ductsizer/id6467117263)

This utility app provides a quick and accurate ductulator for calculating equivalent round and rectangular duct sizes. It supports both Imperial and SI units, offering a simple finger-slide interface for fast computations.

**Highlights:** Quick duct size calculations, Accurate results, Equivalent round and rectangular sizes, IP and SI unit support, Finger slide interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kwanjai Next free?

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

### Is DuctSizer free?

DuctSizer costs $4.99, with no in-app purchases.

### Do Kwanjai Next or DuctSizer have ads?

Neither Kwanjai Next nor DuctSizer shows ads.

### Which is updated more often, Kwanjai Next or DuctSizer?

Kwanjai Next ships an update fortnightly, and DuctSizer every 4 days. Most recently, Kwanjai Next was updated on September 19, 2026 and DuctSizer on June 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.*