# HVAC Pipe Sizer vs Injection Molding Hub

The clearest difference is price: Injection Molding Hub at Free against HVAC Pipe Sizer's $4.99. Injection Molding Hub also leads on update cadence (every 10 days vs every 8 months) and iOS requirement (15.5 vs 17.0). HVAC Pipe Sizer's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Injection Molding Hub is free to download; HVAC Pipe Sizer costs $4.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase and Injection Molding Hub sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

HVAC Pipe Sizer ships an update every 8 months, Injection Molding Hub every 10 days. The most recent releases landed on September 26, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | Injection Molding Hub |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 1 MB | 101 MB |
| Requires iOS | 17.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Muhammad Shahzaib](https://appshunter.io/developer/1803329351) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-liquid/id325069065)

Calculate pipe sizes for liquid systems, including hot and chilled water. Input flow rate, head loss, diameter, or velocity to determine other properties. Supports various liquids, pipe materials, and fittings, with English or metric units.

**Highlights:** Liquid pipe sizing, Hydronic system calculations, Input flow, head loss, diameter, or velocity, Calculate fluid flow and head loss, Supports various liquids and pipe materials, English and metric unit options, Email results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Injection Molding Hub

[App page](https://appshunter.io/ios/app/injection-molding-hub/id6743525270)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Injection Moulding Pro | $8.99 | one-time |
| Pro Access | $34.99 | one-time |


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $4.99, and also offers in-app purchases.

### Is Injection Molding Hub free?

Injection Molding Hub is free to download, with in-app purchases available.

### Do HVAC Pipe Sizer or Injection Molding Hub have ads?

Injection Molding Hub shows ads; HVAC Pipe Sizer does not.

### Which is updated more often, HVAC Pipe Sizer or Injection Molding Hub?

HVAC Pipe Sizer ships an update every 8 months, and Injection Molding Hub every 10 days. Most recently, HVAC Pipe Sizer was updated on September 26, 2026 and Injection Molding Hub on September 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.*