# Power Conversion Calc vs VoltRef Pro

The clearest difference is in-app purchases: Power Conversion Calc at none against VoltRef Pro's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. VoltRef Pro sells 2 in-app purchases, starting at $1.99 per 7 days. Power Conversion Calc asks for nothing beyond the download.

## The numbers

| Metric | Power Conversion Calc | VoltRef Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 6 MB | 19 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Ersel Tarhan](https://appshunter.io/developer/1093545232) |

## What reviewers say

### Power Conversion Calc

[App page](https://appshunter.io/ios/app/power-conversion-calc/id6483929959)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Power Conversion Calc free?

Power Conversion Calc is free to download, with no in-app purchases.

### Is VoltRef Pro free?

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

### Do Power Conversion Calc or VoltRef Pro have ads?

Neither Power Conversion 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.*