# Resistor Tools Pro

> Electronic resistor calculation and combination tool for engineers and hobbyists. (iPhone/iPad app by Siu Yuen Ho.)

- Source: https://appshunter.io/ios/app/resistor-tools-pro/id825620924 (this page in markdown: same URL + `.md`)
- Developer: [Siu Yuen Ho](https://appshunter.io/developer/814088527)
- Category: Utilities
- Price: $0.99
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 4 MB
- Languages: American English, French (France), German (Germany), Hindi, Italian, Japanese, European Portuguese, Russian, Chinese (Simplified, China), European Spanish and 1 more
- Released: 2014-02-28
- Data updated: 2026-06-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/resistor-tools-pro/id825620924/reviews.md

## What is Resistor Tools Pro?

This app is a collection of resistor calculators. It is suitable for hobbyist or electronic engineer. 

 * Calculate resistance of 2 resistors in series or parallel
 * Find out combinations of 2 resistors in series/parallel making a desired resistance
 * Calculate ratio of R1/R2 and voltage divider
 * Find out resistor values of making voltage divider ratio
 * Find out resistor values of making inverting amplifier gain
 * Save combination values in CSV file
 * Share document via AirDrop
 * Upload CSV file to iCloud Drive (For iOS8 or later)

## Key features

- 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


## Frequently asked questions about Resistor Tools Pro

### What is Resistor Tools Pro used for?

Resistor Tools Pro is a utility app that provides various calculators for electronic resistors. It helps users calculate series and parallel resistance, find resistor combinations for desired values, and determine voltage divider and inverting amplifier configurations.

### How much does Resistor Tools Pro cost?

Resistor Tools Pro is a paid application, priced at $0.99. This one-time purchase grants access to all its features without additional costs or subscriptions.

### Does Resistor Tools Pro have ads?

No, Resistor Tools Pro does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

### What devices is Resistor Tools Pro compatible with?

Resistor Tools Pro is designed for iOS devices, including iPhone, iPad, and iPod. It requires iOS 8 or later for features like iCloud Drive integration.

### How often is Resistor Tools Pro updated?

The app was last updated on March 26, 2024, with version 2.6.30. This indicates regular maintenance and potential feature additions or improvements.

### Can I save my resistor calculations with Resistor Tools Pro?

Yes, Resistor Tools Pro allows you to save your calculated resistor combinations in a CSV file. This feature is useful for record-keeping and sharing your work.

### What is the age rating for Resistor Tools Pro?

Resistor Tools Pro has an age rating of 4+. This suggests it is suitable for a wide audience, including younger users interested in electronics.

### What do users like about Resistor Tools Pro?

Based on the available rating, the app is well-received. Users likely appreciate its focused utility for specific electronic calculations and its straightforward functionality.

## Version history (last 5 releases)

### 2.6.30 — 2024-03-26

Fix minor bugs

### 2.6.25 — 2022-02-24

* Support German, French, Italian, Spanish, Portuguese, Japanese, Russian and Hindi

### 2.6.05 — 2022-02-21

* Calculate resistance of n resistors in series  
* Calculate resistance of n resistors in parallel

### 2.4.1 — 2019-12-29

- Fix minor bugs

### 2.4.0 — 2019-12-28

- Support dark mode

## Apps similar to Resistor Tools Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Operational Amplifiers Pro](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953) | 5.0 (1) | $4.99 | Utilities |
| [Electronics Engineering Calc](https://appshunter.io/ios/app/electronics-engineering-calc/id1282943759) | — | Free | Utilities |
| [Operational Amplifiers Guide](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897) | — | Free | Utilities |
| [Capacitor Calculator](https://appshunter.io/ios/app/capacitor-calculator/id1366563133) | 4.7 (3) | $2.99 | Utilities |
| [Electronic Circuits Calc Pro](https://appshunter.io/ios/app/electronic-circuits-calc-pro/id1658493129) | — | $4.99 | Utilities |
| [PeakTech Safety Tester](https://appshunter.io/ios/app/peaktech-safety-tester/id1537039783) | — | Free | Utilities |

## More apps by Siu Yuen Ho

- [Easy Ohm's Law](https://appshunter.io/ios/app/easy-ohms-law/id814088524)
- [RC Circuit Pro](https://appshunter.io/ios/app/rc-circuit-pro/id824145786)
- [RC Circuit](https://appshunter.io/ios/app/rc-circuit/id824460716)
- [Resistor Tools](https://appshunter.io/ios/app/resistor-tools/id826045228)
- [Timer 555 Calculator Pro](https://appshunter.io/ios/app/timer-555-calculator-pro/id833443125)

All apps by Siu Yuen Ho: https://appshunter.io/developer/814088527

## Related topics

[resistor tools pro](https://appshunter.io/ios/topics/resistor-tools-pro) · [resistor tools](https://appshunter.io/ios/topics/resistor-tools)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*