# Substation Digital vs E

The clearest difference is in-app purchases: Substation Digital at none against E's 3. Substation Digital also leads on ads (none vs shown) and iOS requirement (13.4 vs 15.0). E's advantage is device support (4 vs 2). On price and update cadence there is nothing between them.

Both are free to download. E sells 3 in-app purchases, starting at $2.99 per month. Substation Digital asks for nothing beyond the download.

Substation Digital ships an update every 5 weeks, E every 3 weeks. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Substation Digital | E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 42 MB | 37 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [International Organization for Substations Digital Development POWER VIEW](https://appshunter.io/developer/1760809328) | [Mohamed Mubarak](https://appshunter.io/developer/6787548629) |

## What reviewers say

### Substation Digital

[App page](https://appshunter.io/ios/app/substation-digital/id6599860006)

**Features:** macOS Compatibility

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-light-circuit-simulator/id6787548627)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Quarterly | $7.99 | per 3 months |
| Pro Yearly | $24.99 | per year |


## Frequently asked questions

### Is Substation Digital free?

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

### Is E free?

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

### Do Substation Digital or E have ads?

E shows ads; Substation Digital does not.

### Which is updated more often, Substation Digital or E?

Substation Digital ships an update every 5 weeks, and E every 3 weeks. Most recently, Substation Digital was updated on October 17, 2026 and E on October 15, 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.*