# Opamp tools vs Circuit Calculator Pro

The clearest difference is ads: Opamp tools at none against Circuit Calculator Pro's shown. Opamp tools also leads on device support (3 vs 1) and iOS requirement (12.0 vs 26.0). On price and in-app purchases there is nothing between them.

Both are free to download. Opamp tools sells 1 one-off in-app purchase and Circuit Calculator Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Opamp tools | Circuit Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | — |
| Size | 4 MB | 10 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### 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 |


### Circuit Calculator Pro

[App page](https://appshunter.io/ios/app/circuit-calculator-pro/id6757982282)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $2.99 | one-time |


## Frequently asked questions

### Is Opamp tools free?

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

### Is Circuit Calculator Pro free?

Circuit Calculator Pro is free to download, with in-app purchases available.

### Do Opamp tools or Circuit Calculator Pro have ads?

Circuit Calculator Pro shows ads; Opamp tools does not.

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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.*