# Plumbing Formulator vs HVAC Pipe Sizer

The clearest difference is review sentiment: HVAC Pipe Sizer at 71% against Plumbing Formulator's 9%. HVAC Pipe Sizer also leads on chart position (#196 vs unranked) and iOS requirement (15.6 vs 18.6). Plumbing Formulator's advantage is price (Free vs $4.99) and update cadence (every 2 months vs every 6 months). On ads, in-app purchases and device support there is nothing between them.

Plumbing Formulator is free to download; HVAC Pipe Sizer costs $4.99 up front. Plumbing Formulator sells 4 one-off in-app purchases and HVAC Pipe Sizer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Plumbing Formulator ships an update every 2 months, HVAC Pipe Sizer every 6 months. The most recent releases landed on August 23, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | HVAC Pipe Sizer |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/plumbing-formulator/id303497783/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 9.1% of reviews | **71.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#196** |
| Size | 123 MB | 16 MB |
| Requires iOS | 18.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### Plumbing Formulator

[App page](https://appshunter.io/ios/app/plumbing-formulator/id303497783)

This professional calculator app provides over 200 formulas, calculators, and reference materials for plumbers, HVAC technicians, and mechanical contractors. It covers a wide range of calculations for water flow, piping, drainage, water heaters, pumps, and more, all in one pocket-sized tool.

**Highlights:** Over 200 formulas and calculators, Water flow and supply calculations, Pipe and piping calculations, Drainage and venting calculations, Water heater and pump calculations, Reference charts and code books, Pipe cut list optimizer

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | one-time |
| Pro Purchase | $3.99 | one-time |
| Starter | $5.99 | one-time |
| Growth | $9.99 | one-time |


### HVAC Pipe Sizer

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

**Currently charting:** #196 Top Paid · Productivity (US App Store)

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 |


## Frequently asked questions

### Is Plumbing Formulator free?

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

### Is HVAC Pipe Sizer free?

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

### Do Plumbing Formulator or HVAC Pipe Sizer have ads?

Neither Plumbing Formulator nor HVAC Pipe Sizer shows ads.

### Which is updated more often, Plumbing Formulator or HVAC Pipe Sizer?

Plumbing Formulator ships an update every 2 months, and HVAC Pipe Sizer every 6 months. Most recently, Plumbing Formulator was updated on August 23, 2026 and HVAC Pipe Sizer on September 9, 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.*