# Equipment Service Tool vs HVAC Master AI

The clearest difference is ads: HVAC Master AI at none against Equipment Service Tool's shown. HVAC Master AI also leads on update cadence (every 11 days vs every 2 months) and iOS requirement (15.6 vs 17.0). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Equipment Service Tool sells 2 in-app purchases, starting at $0.99 per month and HVAC Master AI sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Equipment Service Tool against 5.0 for HVAC Master AI. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Equipment Service Tool ships an update every 2 months, HVAC Master AI every 11 days. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Equipment Service Tool | HVAC Master AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/equipment-service-tool/id6473715814/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/hvac-master-ai/id6738960643/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 7 MB | 159 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Kaleb Simpson](https://appshunter.io/developer/1719568849) | [alexis atilano](https://appshunter.io/developer/1783149667) |

## What reviewers say

### Equipment Service Tool

[App page](https://appshunter.io/ios/app/equipment-service-tool/id6473715814)

This utility app helps heavy equipment professionals diagnose issues with fault code searches and perform essential calculations. It includes tools for Ohm's Law, unit conversions, and refrigerant charging, supporting numerous manufacturers.

**Highlights:** Fault code search (J1939 SPN/FMI), Ohm's Law calculator, Unit conversion tool, Refrigerant charge calculator, Support for multiple heavy equipment manufacturers, Regular updates

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - One Month | $0.99 | per month |
| Lifetime Unlock | $9.99 | one-time |


### HVAC Master AI

[App page](https://appshunter.io/ios/app/hvac-master-ai/id6738960643)

This mobile assistant helps HVAC technicians diagnose, repair, and optimize heating, ventilation, and air conditioning systems. It provides expert advice, refrigerant information, EPA 608 guidance, and heat pump insights for quick access to solutions.

**Highlights:** Comprehensive HVAC troubleshooting advice, Refrigerant expertise, EPA 608 compliance guidance, Heat pump system insights, Quick access to solutions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly  Subscription | $4.99 | per month |


## Frequently asked questions

### Is Equipment Service Tool free?

Equipment Service Tool is free to download, with in-app purchases available.

### Is HVAC Master AI free?

HVAC Master AI is free to download, with in-app purchases available.

### Which has better reviews, Equipment Service Tool or HVAC Master AI?

Equipment Service Tool and HVAC Master AI are both rated 5.0 out of 5 on the App Store, from 4 and 3 ratings respectively.

### Do Equipment Service Tool or HVAC Master AI have ads?

Equipment Service Tool shows ads; HVAC Master AI does not.

### Which is updated more often, Equipment Service Tool or HVAC Master AI?

Equipment Service Tool ships an update every 2 months, and HVAC Master AI every 11 days. Most recently, Equipment Service Tool was updated on October 16, 2026 and HVAC Master AI on October 24, 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.*