# HVAC Formulator vs ICM X Ref

The clearest difference is price: ICM X Ref at Free against HVAC Formulator's $4.99. ICM X Ref also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 1). On ratings volume, update cadence, ads and device support there is nothing between them.

ICM X Ref is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase. ICM X Ref asks for nothing beyond the download.

ICM X Ref holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | ICM X Ref |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/icm-x-ref/id1198779447/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 73 MB | 50 MB |
| Requires iOS | 18.6 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [ICM controls corp](https://appshunter.io/developer/879929077) |

## 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 |


### ICM X Ref

[App page](https://appshunter.io/ios/app/icm-x-ref/id1198779447)

This application allows users to search for ICM part numbers as aftermarket replacements for OEM products. It also helps locate nearby distributors and provides direct access to ICM technical support.

**Highlights:** Search ICM part numbers, Find aftermarket replacements, Locate distributors, Contact technical support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is ICM X Ref free?

ICM X Ref is free to download, with no in-app purchases.

### Which has better reviews, HVAC Formulator or ICM X Ref?

ICM X Ref is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while ICM X Ref averages 5.0 from 1 ratings.

### Do HVAC Formulator or ICM X Ref have ads?

Neither HVAC Formulator nor ICM X Ref shows ads.

### Which is updated more often, HVAC Formulator or ICM X Ref?

HVAC Formulator ships an update every 2 months, and ICM X Ref every 2 months. Most recently, HVAC Formulator was updated on October 18, 2026 and ICM X Ref on October 14, 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.*