# Resistor Tools Pro vs Resistor AI Calculator

The clearest difference is price: Resistor AI Calculator at Free against Resistor Tools Pro's $0.99. Resistor AI Calculator also leads on ratings volume (5 vs 1). Resistor Tools Pro's advantage is ads (none vs shown) and update cadence (every 2 months vs every 15 months). On in-app purchases and device support there is nothing between them.

Resistor AI Calculator is free to download; Resistor Tools Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Resistor Tools Pro holds the better App Store score, 4.0 against 3.6. That said, the two scores are not equally well evidenced: Resistor AI Calculator has 5 ratings behind it against 1, so its average is the more settled of the two.

Resistor Tools Pro ships an update every 2 months, Resistor AI Calculator every 15 months. The most recent releases landed on October 21, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Resistor Tools Pro | Resistor AI Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/resistor-tools-pro/id825620924/reviews)** | [3.6 (5 ratings)](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 15 months |
| Monetization | Paid | **Ad-supported** |
| Size | 4 MB | 71 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Daichi Takigawa](https://appshunter.io/developer/1569940550) |

## What reviewers say

### Resistor Tools Pro

[App page](https://appshunter.io/ios/app/resistor-tools-pro/id825620924)

This utility app offers a suite of tools for calculating and finding resistor combinations. It's designed for electronics enthusiasts and professionals needing to determine series, parallel, and voltage divider configurations. Save and share your calculations easily.

**Highlights:** Calculate series/parallel resistance, Find resistor combinations for desired resistance, Voltage divider ratio and value calculation, Inverting amplifier gain calculation, Save combinations to CSV, Share via AirDrop, Upload CSV to iCloud Drive

**In-app purchases:** none


### Resistor AI Calculator

[App page](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977)

Point your phone's camera at a resistor to instantly identify its value. Currently supports 4-band carbon film resistors with a 5% tolerance.

**Highlights:** Real-time resistor detection, Automatic resistance calculation, Supports 4-band carbon film resistors, 5% margin of error detection, Uses smartphone camera

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Tools Pro free?

Resistor Tools Pro costs $0.99, with no in-app purchases.

### Is Resistor AI Calculator free?

Resistor AI Calculator is free to download, with no in-app purchases.

### Which has better reviews, Resistor Tools Pro or Resistor AI Calculator?

Resistor Tools Pro is rated higher. Resistor Tools Pro averages 4.0 out of 5 from 1 ratings, while Resistor AI Calculator averages 3.6 from 5 ratings.

### Do Resistor Tools Pro or Resistor AI Calculator have ads?

Resistor AI Calculator shows ads; Resistor Tools Pro does not.

### Which is updated more often, Resistor Tools Pro or Resistor AI Calculator?

Resistor Tools Pro ships an update every 2 months, and Resistor AI Calculator every 15 months. Most recently, Resistor Tools Pro was updated on October 21, 2026 and Resistor AI Calculator 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.*