# NEC Box & Conduit Calc vs VoltRef Pro

NEC Box & Conduit Calc and VoltRef Pro are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. NEC Box & Conduit Calc sells 1 one-off in-app purchase and VoltRef Pro sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | NEC Box & Conduit Calc | VoltRef Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (19 ratings)](https://appshunter.io/ios/app/nec-box-and-conduit-calc/id6755513987/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 40 MB | 19 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Ersel Tarhan](https://appshunter.io/developer/1093545232) |

## What reviewers say

### NEC Box & Conduit Calc

[App page](https://appshunter.io/ios/app/nec-box-and-conduit-calc/id6755513987)

Calculate electrical box and conduit fill accurately according to the NEC. This app provides instant, reliable calculations for electricians, contractors, and students, saving time on job sites. It offers support for various box and conduit types, conductor sizes, and includes wire volume data.

**Highlights:** Box fill calculations, Conduit fill calculations, Wire volume data, Supports multiple conduit types, Supports device counts and clamps, Offline functionality, Clean, simple interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NEC Box Conduit Calc Pro | $4.99 | one-time |


### VoltRef Pro

[App page](https://appshunter.io/ios/app/voltref-pro-electrician-code/id6796596602)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $1.99 | per 7 days |
| Annual Premium | $19.99 | per year |


## Frequently asked questions

### Is NEC Box & Conduit Calc free?

NEC Box & Conduit Calc is free to download, with in-app purchases available.

### Is VoltRef Pro free?

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

### Do NEC Box & Conduit Calc or VoltRef Pro have ads?

Neither NEC Box & Conduit Calc nor VoltRef Pro shows ads.

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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.*