# HVAC Formulator vs Engage by FieldPulse

The clearest difference is price: Engage by FieldPulse at Free against HVAC Formulator's $4.99. Engage by FieldPulse also leads on rating (3.6 vs 2.0) and in-app purchases (none vs 1). On ads and device support there is nothing between them.

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

Engage by FieldPulse holds the better App Store score, 3.6 against 2.0. That said, the two scores are not equally well evidenced: Engage by FieldPulse has 18 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 40% of Engage by FieldPulse's.

HVAC Formulator ships an update every 2 months, Engage by FieldPulse every 3 weeks. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | Engage by FieldPulse |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[3.6 (18 ratings)](https://appshunter.io/ios/app/engage-by-fieldpulse/id1578327316/reviews)** |
| Number of ratings | 1 | **18** |
| Positive reviews | 9.1% of reviews | **40.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 73 MB | 82 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Flicent Inc](https://appshunter.io/developer/1100839833) |

## 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 |


### Engage by FieldPulse

[App page](https://appshunter.io/ios/app/engage-by-fieldpulse/id1578327316)

Manage all your customer communication in one place. This app integrates phone calls, text messaging, and voicemail for streamlined customer interactions.

**Highlights:** Integrated phone system, Manage customer interactions, Phone calls, Text messaging, Voicemail management

**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 Engage by FieldPulse free?

Engage by FieldPulse is free to download, with no in-app purchases.

### Which has better reviews, HVAC Formulator or Engage by FieldPulse?

Engage by FieldPulse is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while Engage by FieldPulse averages 3.6 from 18 ratings.

### Do HVAC Formulator or Engage by FieldPulse have ads?

Neither HVAC Formulator nor Engage by FieldPulse shows ads.

### Which is updated more often, HVAC Formulator or Engage by FieldPulse?

HVAC Formulator ships an update every 2 months, and Engage by FieldPulse every 3 weeks. Most recently, HVAC Formulator was updated on October 31, 2026 and Engage by FieldPulse on November 3, 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.*