# Opamp tools vs Circuit Simulator

The clearest difference is update cadence: Circuit Simulator at every 6 weeks against Opamp tools's every 12 months. Opamp tools's advantage is iOS requirement (12.0 vs 15.3). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Opamp tools sells 1 one-off in-app purchase and Circuit Simulator sells 8 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Opamp tools ships an update every 12 months, Circuit Simulator every 6 weeks. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Opamp tools | Circuit Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (92 ratings)](https://appshunter.io/ios/app/circuit-simulator-voltsim/id6736870364/reviews)** |
| Number of ratings | — | **92** |
| Positive reviews | — | 76.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 6 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 4 MB | 103 MB |
| Requires iOS | **12.0** | 15.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Sindhu Gopi](https://appshunter.io/developer/1773585161) |

## 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 Simulator

[App page](https://appshunter.io/ios/app/circuit-simulator-voltsim/id6736870364)

Design and simulate electronic and digital circuits in real-time. Visualize voltage and current flow, and analyze circuit behavior with tools like oscilloscopes and multimeters. Offers a user-friendly experience for circuit design and digital electronic analysis.

**Highlights:** Real-time electronic circuit simulation, Digital circuit simulation, Voltage and current analysis, Multichannel oscilloscope, Multimeter tools, Circuit design and tuning

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extensions Subscription | $0.99 | per month |
| Sensors Extension | $0.99 | one-time |
| Custom Chips Extension | $1.99 | one-time |
| Instruments extension | $2.99 | one-time |
| Analog Extension | $3.99 | one-time |
| Misc Extension | $3.99 | one-time |
| Digital Extension | $3.99 | one-time |
| Extension Pack | $12.99 | one-time |


## Frequently asked questions

### Is Opamp tools free?

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

### Is Circuit Simulator free?

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

### Do Opamp tools or Circuit Simulator have ads?

Neither Opamp tools nor Circuit Simulator shows ads.

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

Opamp tools ships an update every 12 months, and Circuit Simulator every 6 weeks. Most recently, Opamp tools was updated on October 10, 2026 and Circuit Simulator on October 25, 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.*