# Voltage Drop Pro vs Voltage Calculator

The clearest difference is in-app purchases: Voltage Calculator at none against Voltage Drop Pro's 1. Voltage Calculator also leads on update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Voltage Drop Pro sells 1 one-off in-app purchase. Voltage Calculator asks for nothing beyond the download.

Voltage Drop Pro ships an update every 3 months, Voltage Calculator every 2 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | Voltage Drop Pro | Voltage Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 39 MB | 72 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BRUCE RAY MCCAMPBELL](https://appshunter.io/developer/6772438648) | [ESDEV Teknoloji](https://appshunter.io/developer/1693053468) |

## What reviewers say

### Voltage Drop Pro

[App page](https://appshunter.io/ios/app/voltage-drop-pro-electrician/id6781791471)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Voltage Drop Pro | $2.99 | one-time |


### Voltage Calculator

[App page](https://appshunter.io/ios/app/voltage-calculator/id6790529321)

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

**In-app purchases:** none


## Frequently asked questions

### Is Voltage Drop Pro free?

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

### Is Voltage Calculator free?

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

### Do Voltage Drop Pro or Voltage Calculator have ads?

Neither Voltage Drop Pro nor Voltage Calculator shows ads.

### Which is updated more often, Voltage Drop Pro or Voltage Calculator?

Voltage Drop Pro ships an update every 3 months, and Voltage Calculator every 2 weeks. Most recently, Voltage Drop Pro was updated on October 28, 2026 and Voltage Calculator on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*