# HVAC Formulator vs HVAC Pipe Sizer

The clearest difference is review sentiment: HVAC Pipe Sizer at 100% against HVAC Formulator's 9%. HVAC Pipe Sizer also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 1). HVAC Formulator's advantage is update cadence (every 2 months vs every 9 months). On price, ratings volume, ads and monetization model there is nothing between them.

HVAC Formulator costs $4.99 and HVAC Pipe Sizer $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase. HVAC Pipe Sizer asks for nothing beyond the download.

HVAC Pipe Sizer holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 100% of HVAC Pipe Sizer's.

HVAC Formulator ships an update every 2 months, HVAC Pipe Sizer every 9 months. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | HVAC Pipe Sizer |
| --- | --- | --- |
| Price | $4.99 | $4.99 |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-low/id341688321/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 9.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Paid | Paid |
| Size | 73 MB | 1 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### HVAC Formulator

[App page](https://appshunter.io/ios/app/hvac-formulator/id318898907)

This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.

**Highlights:** Over 900 formulas and calculations, US & Metric unit support, 23 calculator categories, 460+ unit conversions, 8 temperature scales, Offline functionality, Save and share results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Pro | $3.99 | one-time |


### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-low/id341688321)

Quickly size low-pressure gas piping systems by inputting flow, pressure drop, diameter, or velocity. Includes detailed gas and pipe properties, fitting data, and unit conversion.

**Highlights:** Low pressure gas pipe sizing, Input flow, pressure drop, diameter, or velocity, Calculate exact and nominal pipe diameters, Specify gas and pipe properties, Includes pipe fitting equivalent lengths, English and metric unit display

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $4.99, with no in-app purchases.

### Which has better reviews, HVAC Formulator or HVAC Pipe Sizer?

HVAC Pipe Sizer is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while HVAC Pipe Sizer averages 5.0 from 2 ratings.

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

Neither HVAC Formulator nor HVAC Pipe Sizer shows ads.

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

HVAC Formulator ships an update every 2 months, and HVAC Pipe Sizer every 9 months. Most recently, HVAC Formulator was updated on October 31, 2026 and HVAC Pipe Sizer on November 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.*