# SMART Service Tool vs Join Vars

The clearest difference is iOS requirement: Join Vars at 15.1 against SMART Service Tool's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 26, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | SMART Service Tool | Join Vars |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (21 ratings)](https://appshunter.io/ios/app/smart-service-tool/id918610107/reviews)** | — |
| Number of ratings | **21** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 62 MB | 46 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rodrigo Miranda](https://appshunter.io/developer/1742641426) | [VARS HEALTH, INC.](https://appshunter.io/developer/1719976023) |

## What reviewers say

### SMART Service Tool

[App page](https://appshunter.io/ios/app/smart-service-tool/id918610107)

This tool helps HVACR technicians quickly convert pressure to temperature and calculate superheat/subcooling using refrigerant data. It offers selectable units, customizable displays, and the ability to record and email data.

**Highlights:** Pressure to temperature conversion, Superheat and subcooling calculation, Selectable units of measure, Digital or analog display modes, Record and email data, Over 65 refrigerants supported

**In-app purchases:** none


### Join Vars

[App page](https://appshunter.io/ios/app/join-vars/id6755112225)

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

**In-app purchases:** none


## Frequently asked questions

### Is SMART Service Tool free?

SMART Service Tool is free to download, with no in-app purchases.

### Is Join Vars free?

Join Vars is free to download, with no in-app purchases.

### Do SMART Service Tool or Join Vars have ads?

Neither SMART Service Tool nor Join Vars shows ads.

### Which is updated more often, SMART Service Tool or Join Vars?

SMART Service Tool ships an update every 3 weeks, and Join Vars every 3 weeks. Most recently, SMART Service Tool was updated on October 26, 2026 and Join Vars on October 15, 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.*