# Electronics docs & calculators vs Opamp tools

The clearest difference is price: Opamp tools at Free against Electronics docs & calculators's $4.99. Electronics docs & calculators's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Opamp tools is free to download; Electronics docs & calculators costs $4.99 up front. Opamp tools sells 1 one-off in-app purchase. Electronics docs & calculators asks for nothing beyond the download.

Electronics docs & calculators ships an update every 6 months, Opamp tools every 12 months. The most recent releases landed on September 9, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Electronics docs & calculators | Opamp tools |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/electronics-docs-and-calculators/id1581668963/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Paid | — |
| Size | 49 MB | 4 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anas Abubakar](https://appshunter.io/developer/1581534101) | [Siu Yuen Ho](https://appshunter.io/developer/814088527) |

## What reviewers say

### Electronics docs & calculators

[App page](https://appshunter.io/ios/app/electronics-docs-and-calculators/id1581668963)

This app serves as a pocket electronics lab, offering a comprehensive reference for components and circuits. It simplifies complex calculations for filters, inductors, and various circuit configurations, aiding engineers and hobbyists in their designs.

**Highlights:** Electronic component reference, Electronic circuit reference, Filter calculation tools, Inductor winding calculators, Resistor and capacitor calculations, Ohm's Law calculator, AC/DC power calculations

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

**In-app purchases:** none


### Opamp tools

[App page](https://appshunter.io/ios/app/opamp-tools/id1616271826)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock pro feature | $1.99 | one-time |


## Frequently asked questions

### Is Electronics docs & calculators free?

Electronics docs & calculators costs $4.99, with no in-app purchases.

### Is Opamp tools free?

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

### Do Electronics docs & calculators or Opamp tools have ads?

Neither Electronics docs & calculators nor Opamp tools shows ads.

### Which is updated more often, Electronics docs & calculators or Opamp tools?

Electronics docs & calculators ships an update every 6 months, and Opamp tools every 12 months. Most recently, Electronics docs & calculators was updated on September 9, 2026 and Opamp tools on May 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.*