# DigiCompCalc vs Operational Amplifiers Guide

The clearest difference is ads: DigiCompCalc at none against Operational Amplifiers Guide's shown. Operational Amplifiers Guide's advantage is update cadence (every 2 months vs every 68 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DigiCompCalc ships an update every 68 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | DigiCompCalc | Operational Amplifiers Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/digicompcalc/id559620424/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 68 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 1 MB | 17 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ernie Zappacosta](https://appshunter.io/developer/509385502) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### DigiCompCalc

[App page](https://appshunter.io/ios/app/digicompcalc/id559620424)

This utility app simplifies digital power compensator coefficient calculations. It allows users to input data and obtain results directly on their mobile device, eliminating the need for complex desktop software. Results can be emailed for easy sharing.

**Highlights:** Calculate coefficients from analog compensator values, Calculate coefficients directly using poles and zeros, Email results, Remembers last calculated variables, Dark Mode support

**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 DigiCompCalc free?

DigiCompCalc 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 DigiCompCalc or Operational Amplifiers Guide have ads?

Operational Amplifiers Guide shows ads; DigiCompCalc does not.

### Which is updated more often, DigiCompCalc or Operational Amplifiers Guide?

DigiCompCalc ships an update every 68 months, and Operational Amplifiers Guide every 2 months. Most recently, DigiCompCalc was updated on October 5, 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.*