# SmarTech vs Desired Resistance Calculator

The clearest difference is review sentiment: Desired Resistance Calculator at 100% against SmarTech's 25%. SmarTech's advantage is price (Free vs $1.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

SmarTech is free to download; Desired Resistance Calculator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SmarTech ships an update every 12 months, Desired Resistance Calculator every 10 months. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SmarTech | Desired Resistance Calculator |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.6 (9 ratings)](https://appshunter.io/ios/app/smartech/id1071783318/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 10 months** |
| Monetization | **Free** | Paid |
| Size | 21 MB | 1 MB |
| Requires iOS | 15.6 | **14.4** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Uniweld Products, Inc.](https://appshunter.io/developer/1097526384) | [Ekrem Nurdag](https://appshunter.io/developer/1606169736) |

## What reviewers say

### SmarTech

[App page](https://appshunter.io/ios/app/smartech/id1071783318)

This app connects to a digital manifold to display accurate pressure and temperature readings. It offers real-time Superheat and Subcooling calculations, supports over 109 refrigerants, and features a "Smart Charge Zone" for optimal system charging. Users can also generate and export system performance reports.

**Highlights:** Real-time pressure and temperature readings, Superheat and Subcooling calculations, 109+ refrigerant types supported, Smart Charge Zone indicator, System performance reporting, PDF/CSV report export

**Features:** macOS Compatibility

**In-app purchases:** none


### Desired Resistance Calculator

[App page](https://appshunter.io/ios/app/desired-resistance-calculator/id1606169404)

This tool helps you find the closest standard resistor value by combining two standard resistors in series or parallel. It supports E12 and E24 resistor series for precise calculations.

**Highlights:** Calculates series resistor combinations, Calculates parallel resistor combinations, Supports E12 resistor series, Supports E24 resistor series, Finds closest approximation to desired value

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SmarTech free?

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

### Is Desired Resistance Calculator free?

Desired Resistance Calculator costs $1.99, with no in-app purchases.

### Do SmarTech or Desired Resistance Calculator have ads?

Neither SmarTech nor Desired Resistance Calculator shows ads.

### Which is updated more often, SmarTech or Desired Resistance Calculator?

SmarTech ships an update every 12 months, and Desired Resistance Calculator every 10 months. Most recently, SmarTech was updated on October 24, 2026 and Desired Resistance Calculator on October 13, 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.*