# Dialing Code vs Operational Amplifiers Pro

The clearest difference is rating: Operational Amplifiers Pro at 5.0 against Dialing Code's 3.0. Operational Amplifiers Pro also leads on update cadence (every 2 months vs every 12 months). Dialing Code's advantage is price ($1.99 vs $4.99) and iOS requirement (11.0 vs 16.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Dialing Code costs $1.99 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 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Dialing Code ships an update every 12 months, Operational Amplifiers Pro every 2 months. The most recent releases landed on August 14, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Dialing Code | Operational Amplifiers Pro |
| --- | --- | --- |
| Price | **$1.99** | $4.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/dialing-code/id680185024/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 4 MB | 14 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [LionsApp di Nallbati Elton](https://appshunter.io/developer/432915499) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Dialing Code

[App page](https://appshunter.io/ios/app/dialing-code/id680185024)

Access a comprehensive list of international dialing codes for 250 countries. Easily search for country prefixes, view country maps, and save your favorite codes. Share country information effortlessly.

**Highlights:** 250 country prefixes, Search by country or prefix, Country information with map, Personal favorites list, Share country information, Retina graphics, Easy to use

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

**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 Dialing Code free?

Dialing Code costs $1.99, 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, Dialing Code or Operational Amplifiers Pro?

Operational Amplifiers Pro is rated higher. Dialing Code averages 3.0 out of 5 from 2 ratings, while Operational Amplifiers Pro averages 5.0 from 1 ratings.

### Do Dialing Code or Operational Amplifiers Pro have ads?

Neither Dialing Code nor Operational Amplifiers Pro shows ads.

### Which is updated more often, Dialing Code or Operational Amplifiers Pro?

Dialing Code ships an update every 12 months, and Operational Amplifiers Pro every 2 months. Most recently, Dialing Code was updated on August 14, 2026 and Operational Amplifiers Pro 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.*