# WOLF by 24 FIX vs DuctSizer

The clearest difference is price: WOLF by 24 FIX at Free against DuctSizer's $4.99. DuctSizer's advantage is update cadence (every 4 days vs weekly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

WOLF by 24 FIX is free to download; DuctSizer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

WOLF by 24 FIX ships an update weekly, DuctSizer every 4 days. The most recent releases landed on September 18, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | WOLF by 24 FIX | DuctSizer |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | — | Paid |
| Size | 45 MB | 57 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [24 Solution Group (Thailand) Co., Ltd.](https://appshunter.io/developer/1462277497) | [MULBERRYSOFT COMPANY LIMITED](https://appshunter.io/developer/1612779919) |

## What reviewers say

### WOLF by 24 FIX

[App page](https://appshunter.io/ios/app/wolf-by-24-fix/id1580034286)

**Features:** macOS Compatibility

**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 WOLF by 24 FIX free?

WOLF by 24 FIX is free to download, with no in-app purchases.

### Is DuctSizer free?

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

### Do WOLF by 24 FIX or DuctSizer have ads?

Neither WOLF by 24 FIX nor DuctSizer shows ads.

### Which is updated more often, WOLF by 24 FIX or DuctSizer?

WOLF by 24 FIX ships an update weekly, and DuctSizer every 4 days. Most recently, WOLF by 24 FIX was updated on September 18, 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.*