# Operational Amplifiers Pro vs iCrucible

The clearest difference is price: iCrucible at Free against Operational Amplifiers Pro's $4.99. Operational Amplifiers Pro's advantage is in-app purchases (none vs 8). On update cadence, ads, device support and iOS requirement there is nothing between them.

iCrucible is free to download; Operational Amplifiers Pro costs $4.99 up front. iCrucible sells 8 in-app purchases, starting at $2.99 per month. Operational Amplifiers Pro asks for nothing beyond the download.

Operational Amplifiers Pro ships an update every 2 months, iCrucible every 5 months. The most recent releases landed on September 25, 2026 and December 24, 2025 respectively.

## The numbers

| Metric | Operational Amplifiers Pro | iCrucible |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Paid | — |
| Size | 14 MB | 172 MB |
| Requires iOS | **16.0** | 17.2 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [RIMCS LLC](https://appshunter.io/developer/1695388876) |

## What reviewers say

### 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


### iCrucible

[App page](https://appshunter.io/ios/app/icrucible/id6468351223)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $2.99 | per month |
| Premium | $4.99 | per month |
| Standard | $29.99 | per year |
| Premium | $49.99 | per year |
| 500 Flame Gems | $4.99 | one-time |
| 2,500 Flame Gems | $23.99 | one-time |
| 5,000 Flame Gems | $46.99 | one-time |
| 10,000 Flame Gems | $91.90 | one-time |


## Frequently asked questions

### Is Operational Amplifiers Pro free?

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

### Is iCrucible free?

iCrucible is free to download, with in-app purchases available.

### Do Operational Amplifiers Pro or iCrucible have ads?

Neither Operational Amplifiers Pro nor iCrucible shows ads.

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

Operational Amplifiers Pro ships an update every 2 months, and iCrucible every 5 months. Most recently, Operational Amplifiers Pro was updated on September 25, 2026 and iCrucible on December 24, 2025.

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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.*