# E vs Building Wire Selector

The clearest difference is update cadence: Building Wire Selector at every 5 months against E's every 18 months. E's advantage is iOS requirement (13.0 vs 16.6). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for E against 5.0 for Building Wire Selector. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

E ships an update every 18 months, Building Wire Selector every 5 months. The most recent releases landed on September 12, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | E | Building Wire Selector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/e-wire-calc/id885429495/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/building-wire-selector/id6670218338/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 26 MB | 6 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ELEKTRISOLA](https://appshunter.io/developer/885429498) | [Southwire Company](https://appshunter.io/developer/440338423) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-wire-calc/id885429495)

This tool helps determine technical characteristics of enamelled copper wire based on industry standards. It offers functions for diameter conversion, resistance calculations, and breakdown voltage.

**Highlights:** Diameter conversion (mm, inch, AWG), Resistance calculation, Metal wire diameter calculation, Resistance tolerance, Enamelled copper quantity and length, Breakdown voltage, Winding tension calculation, Overall diameter tolerance

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

**In-app purchases:** none


### Building Wire Selector

[App page](https://appshunter.io/ios/app/building-wire-selector/id6670218338)

This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.

**Highlights:** Conductor size determination, Wire and cable type selection, National Electrical Code compliance, Electrical installation guidance

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is Building Wire Selector free?

Building Wire Selector is free to download, with no in-app purchases.

### Which has better reviews, E or Building Wire Selector?

E and Building Wire Selector are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do E or Building Wire Selector have ads?

Neither E nor Building Wire Selector shows ads.

### Which is updated more often, E or Building Wire Selector?

E ships an update every 18 months, and Building Wire Selector every 5 months. Most recently, E was updated on September 12, 2026 and Building Wire Selector on August 30, 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.*