# Opamp tools vs Circuit

The clearest difference is in-app purchases: Circuit at none against Opamp tools's 1. Circuit also leads on update cadence (every 5 weeks vs every 12 months). Opamp tools's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.1). On price and device support there is nothing between them.

Both are free to download. Opamp tools sells 1 one-off in-app purchase. Circuit asks for nothing beyond the download.

Opamp tools ships an update every 12 months, Circuit every 5 weeks. The most recent releases landed on September 26, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Opamp tools | Circuit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/circuit-design/id1618728154/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 5 weeks** |
| Monetization | — | Ad-supported |
| Size | 4 MB | 35 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## 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

[App page](https://appshunter.io/ios/app/circuit-design/id1618728154)

Design, analyze, and solve electrical circuits with this comprehensive tool. It supports various circuit types, simplifies complex networks step-by-step, and includes educational resources on electrical laws and formulas. Save and share your designs locally.

**Highlights:** Design and analyze electrical circuits, Simplify complex resistor, capacitor, and inductor networks, Convert delta to wye and vice versa, Convert current to voltage sources and vice versa, Design or find resistor values, Step-by-step simplification visualization, Educational study tab with electrical laws and formulas

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Opamp tools free?

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

### Is Circuit free?

Circuit is free to download, with no in-app purchases.

### Do Opamp tools or Circuit have ads?

Circuit shows ads; Opamp tools does not.

### Which is updated more often, Opamp tools or Circuit?

Opamp tools ships an update every 12 months, and Circuit every 5 weeks. Most recently, Opamp tools was updated on September 26, 2026 and Circuit on June 5, 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.*