# F4S vs Circuit Resistance Creator

The clearest difference is update cadence: Circuit Resistance Creator at every 3 weeks against F4S's every 6 weeks. F4S's advantage is iOS requirement (12.2 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

F4S ships an update every 6 weeks, Circuit Resistance Creator every 3 weeks. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | F4S | Circuit Resistance Creator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/circuit-resistance-creator/id1475404949/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 25 MB | 15 MB |
| Requires iOS | **12.2** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CAPSOL, LLC](https://appshunter.io/developer/1394185059) | [David White](https://appshunter.io/developer/911163945) |

## What reviewers say

### F4S

[App page](https://appshunter.io/ios/app/f4s/id1451079732)

**Features:** Vision Pro support

**In-app purchases:** none


### Circuit Resistance Creator

[App page](https://appshunter.io/ios/app/circuit-resistance-creator/id1475404949)

Calculate equivalent resistance for any resistor circuit. This tool is designed for students, technicians, and engineers, offering high accuracy for voltage, current, and resistance. It's a great way to check homework and perform engineering calculations.

**Highlights:** Equivalent resistance calculation, Supports any resistor circuit, High accuracy displays (6 decimal places), Apply custom circuit voltages, Designed for students and engineers, Homework checking tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is F4S free?

F4S is free to download, with no in-app purchases.

### Is Circuit Resistance Creator free?

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

### Do F4S or Circuit Resistance Creator have ads?

Neither F4S nor Circuit Resistance Creator shows ads.

### Which is updated more often, F4S or Circuit Resistance Creator?

F4S ships an update every 6 weeks, and Circuit Resistance Creator every 3 weeks. Most recently, F4S was updated on September 9, 2026 and Circuit Resistance Creator on June 1, 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.*