# DuctSizer vs Banpu NEXT

The clearest difference is price: Banpu NEXT at Free against DuctSizer's $4.99. DuctSizer's advantage is update cadence (every 4 days vs every 6 weeks) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

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

DuctSizer ships an update every 4 days, Banpu NEXT every 6 weeks. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | DuctSizer | Banpu NEXT |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Monetization | Paid | — |
| Size | 57 MB | 64 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Mulberrysoft](https://appshunter.io/developer/1612779919) | [BANPU NEXT CO., LTD.](https://appshunter.io/developer/1347711142) |

## What reviewers say

### 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, Vision Pro support

**In-app purchases:** none


### Banpu NEXT

[App page](https://appshunter.io/ios/app/banpu-next/id6474217928)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DuctSizer free?

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

### Is Banpu NEXT free?

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

### Do DuctSizer or Banpu NEXT have ads?

Neither DuctSizer nor Banpu NEXT shows ads.

### Which is updated more often, DuctSizer or Banpu NEXT?

DuctSizer ships an update every 4 days, and Banpu NEXT every 6 weeks. Most recently, DuctSizer was updated on October 14, 2026 and Banpu NEXT on October 8, 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.*