# Resistor AI Calculator vs Operational Amplifiers Guide

The clearest difference is update cadence: Operational Amplifiers Guide at every 2 months against Resistor AI Calculator's every 15 months. 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.

Resistor AI Calculator ships an update every 15 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Resistor AI Calculator | Operational Amplifiers Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (5 ratings)](https://appshunter.io/ios/app/resistor-ai-calculator/id1587462977/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | Ad-supported | — |
| Size | 71 MB | 17 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daichi Takigawa](https://appshunter.io/developer/1569940550) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### 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


### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Resistor AI Calculator free?

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

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Do Resistor AI Calculator or Operational Amplifiers Guide have ads?

Both Resistor AI Calculator and Operational Amplifiers Guide show ads.

### Which is updated more often, Resistor AI Calculator or Operational Amplifiers Guide?

Resistor AI Calculator ships an update every 15 months, and Operational Amplifiers Guide every 2 months. Most recently, Resistor AI Calculator was updated on October 15, 2026 and Operational Amplifiers Guide on October 1, 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.*