# CircuitShepherd vs Resistor

The clearest difference is review sentiment: Resistor at 50% against CircuitShepherd's 0%. Resistor also leads on rating (3.0 vs 1.5) and in-app purchases (none vs 1). CircuitShepherd's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 16 months). On price, ratings volume, device support and iOS requirement there is nothing between them.

Both are free to download. CircuitShepherd sells 1 in-app purchase, starting at $6.99 per month. Resistor asks for nothing beyond the download.

Resistor holds the better App Store score, 3.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 0% of CircuitShepherd's written reviews are positive against 50% of Resistor's.

CircuitShepherd ships an update every 3 weeks, Resistor every 16 months. The most recent releases landed on June 4, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | CircuitShepherd | Resistor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/circuitshepherd/id1598606653/reviews) | **[3.0 (3 ratings)](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625/reviews)** |
| Number of ratings | 2 | **3** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 16 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 49 MB | 22 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Josef Woess](https://appshunter.io/developer/1597520399) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### CircuitShepherd

[App page](https://appshunter.io/ios/app/circuitshepherd/id1598606653)

Automate electronic circuit design with AI-driven parameter optimization. Define schematics and design goals, and the software finds optimal part values in real-time. Save time on calculations and iterations with this intuitive tool.

**Highlights:** Automated parameter optimization, AI-driven circuit engineering, Real-time design goal finding, Intuitive user interface, Schematic definition, Part value calculation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| full version | $6.99 | per month |


### Resistor

[App page](https://appshunter.io/ios/app/resistor-electronics-tools/id6504726625)

This application simplifies electronic circuit calculations with tools for series/parallel resistance, LED current limiting, and three-phase circuit conversions. It also features a resistor color code decoder for quick component identification.

**Highlights:** Series/parallel resistor calculator, LED series resistor calculator, Star-delta and delta-star converters, Resistor color code decoder, Intuitive interface

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

**In-app purchases:** none


## Frequently asked questions

### Is CircuitShepherd free?

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

### Is Resistor free?

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

### Which has better reviews, CircuitShepherd or Resistor?

Resistor is rated higher. CircuitShepherd averages 1.5 out of 5 from 2 ratings, while Resistor averages 3.0 from 3 ratings.

### Do CircuitShepherd or Resistor have ads?

Resistor shows ads; CircuitShepherd does not.

### Which is updated more often, CircuitShepherd or Resistor?

CircuitShepherd ships an update every 3 weeks, and Resistor every 16 months. Most recently, CircuitShepherd was updated on June 4, 2026 and Resistor on September 9, 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.*