# SMART Service Tool vs D

The clearest difference is update cadence: SMART Service Tool at every 3 weeks against D's every 5 months. D's advantage is iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

SMART Service Tool ships an update every 3 weeks, D every 5 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SMART Service Tool | D |
| --- | --- | --- |
| 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 5 months |
| Monetization | Free | — |
| Size | 62 MB | 23 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Rodrigo Miranda](https://appshunter.io/developer/1742641426) | [INFICON](https://appshunter.io/developer/901401219) |

## 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


### D

[App page](https://appshunter.io/ios/app/d-tek-pro/id6749635092)

**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 D free?

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

### Do SMART Service Tool or D have ads?

Neither SMART Service Tool nor D shows ads.

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

SMART Service Tool ships an update every 3 weeks, and D every 5 months. Most recently, SMART Service Tool was updated on November 1, 2026 and D on October 30, 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.*