# Voltage Drop Calculator. vs Thunder Fridge Controller

The clearest difference is in-app purchases: Thunder Fridge Controller at none against Voltage Drop Calculator.'s 1. Thunder Fridge Controller also leads on ads (none vs shown) and update cadence (weekly vs every 3 months). On price and device support there is nothing between them.

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

Voltage Drop Calculator. ships an update every 3 months, Thunder Fridge Controller weekly. The most recent releases landed on October 18, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Voltage Drop Calculator. | Thunder Fridge Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (410 ratings)](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064/reviews)** | — |
| Number of ratings | **410** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 10 MB |
| Requires iOS | 17.6 | **10.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [显松 罗](https://appshunter.io/developer/585124175) |

## What reviewers say

### Voltage Drop Calculator.

[App page](https://appshunter.io/ios/app/voltage-drop-calculator/id1203737064)

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

**Highlights:** NEC and IEC dual standards, Voltage drop and wire sizing calculations, Support for continuous load and corrections, Copper or Aluminum conductor options, Single-phase and three-phase systems, Automatic compliance checks, PDF report generation

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $4.99 | one-time |


### Thunder Fridge Controller

[App page](https://appshunter.io/ios/app/thunder-fridge-controller/id1252350226)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Voltage Drop Calculator. free?

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

### Is Thunder Fridge Controller free?

Thunder Fridge Controller is free to download, with no in-app purchases.

### Do Voltage Drop Calculator. or Thunder Fridge Controller have ads?

Voltage Drop Calculator. shows ads; Thunder Fridge Controller does not.

### Which is updated more often, Voltage Drop Calculator. or Thunder Fridge Controller?

Voltage Drop Calculator. ships an update every 3 months, and Thunder Fridge Controller weekly. Most recently, Voltage Drop Calculator. was updated on October 18, 2026 and Thunder Fridge Controller on September 18, 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.*