# Resistor Tools Pro vs Operational Amplifiers Pro

The clearest difference is rating: Operational Amplifiers Pro at 5.0 against Resistor Tools Pro's 4.0. Resistor Tools Pro's advantage is price ($0.99 vs $4.99) and iOS requirement (12.0 vs 16.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Resistor Tools Pro costs $0.99 and Operational Amplifiers Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Operational Amplifiers Pro holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on June 25, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Resistor Tools Pro | Operational Amplifiers Pro |
| --- | --- | --- |
| Price | **$0.99** | $4.99 |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/resistor-tools-pro/id825620924/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | Paid |
| Size | 4 MB | 14 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## 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


### Operational Amplifiers Pro

[App page](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953)

This app provides interactive calculators and reference information for designing and analyzing op-amp circuits. It offers step-by-step explanations and technical data on popular op-amp series, aiding students and engineers in circuit development and prototyping.

**Highlights:** Interactive op-amp circuit calculators, Step-by-step explanations and formulas, Reference data on op-amps and comparators, Support for 14 languages, Light and dark mode, Advanced calculators and circuit guides (Pro), Full-text search (Pro)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Tools Pro free?

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

### Is Operational Amplifiers Pro free?

Operational Amplifiers Pro costs $4.99, with no in-app purchases.

### Which has better reviews, Resistor Tools Pro or Operational Amplifiers Pro?

Operational Amplifiers Pro is rated higher. Resistor Tools Pro averages 4.0 out of 5 from 1 ratings, while Operational Amplifiers Pro averages 5.0 from 1 ratings.

### Do Resistor Tools Pro or Operational Amplifiers Pro have ads?

Neither Resistor Tools Pro nor Operational Amplifiers Pro shows ads.

### Which is updated more often, Resistor Tools Pro or Operational Amplifiers Pro?

Resistor Tools Pro ships an update every 2 months, and Operational Amplifiers Pro every 2 months. Most recently, Resistor Tools Pro was updated on June 25, 2026 and Operational Amplifiers Pro on September 16, 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.*