# e vs CircuitShepherd

The clearest difference is price: CircuitShepherd at Free against e's $0.99. CircuitShepherd also leads on update cadence (every 3 weeks vs every 6 months). e's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 14.0). On review sentiment, ads and device support there is nothing between them.

CircuitShepherd is free to download; e costs $0.99 up front. CircuitShepherd sells 1 in-app purchase, starting at $6.99 per month. e asks for nothing beyond the download.

e ships an update every 6 months, CircuitShepherd every 3 weeks. The most recent releases landed on September 18, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | e | CircuitShepherd |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[1.5 (2 ratings)](https://appshunter.io/ios/app/circuitshepherd/id1598606653/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 10 MB | 49 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [e-skett Corp.](https://appshunter.io/developer/591591895) | [Josef Woess](https://appshunter.io/developer/1597520399) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-calcpro/id603391408)

A powerful calculator app supporting scientific and engineering notation with a wide range of functions and constants. It offers features like calculation history, user-defined variables, and formula insertion for complex computations.

**Highlights:** Scientific and engineering notation, Calculation history, User-defined constants and variables, Advanced mathematical functions, Formula insertion, Autocomplete parentheses

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is e free?

e costs $0.99, with no in-app purchases.

### Is CircuitShepherd free?

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

### Do e or CircuitShepherd have ads?

Neither e nor CircuitShepherd shows ads.

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

e ships an update every 6 months, and CircuitShepherd every 3 weeks. Most recently, e was updated on September 18, 2026 and CircuitShepherd on June 4, 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.*