# Southwire® Voltage Drop Calc vs BinMaster Sensor App

The clearest difference is update cadence: Southwire® Voltage Drop Calc at every 2 months against BinMaster Sensor App's every 9 months. BinMaster Sensor App's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Southwire® Voltage Drop Calc ships an update every 2 months, BinMaster Sensor App every 9 months. Both last shipped on September 17, 2026.

## The numbers

| Metric | Southwire® Voltage Drop Calc | BinMaster Sensor App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 48.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free | — |
| Size | 10 MB | 221 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Southwire Company](https://appshunter.io/developer/440338423) | [Garner Industries](https://appshunter.io/developer/1585219665) |

## What reviewers say

### Southwire® Voltage Drop Calc

[App page](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420)

Calculate the appropriate wire size for electrical circuits. This tool helps determine wire size based on voltage drop and current carrying capacity, ensuring compliance with NEC ampacity limits.

**Highlights:** Determine wire size for voltage drop, Calculate voltage drop for conductor runs, Limit wire size by voltage drop, Limit wire size by NEC ampacity, Supports AWG and KCMIL sizes

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick and useful
- 🚀 Great Quick Reference
- 👍 A must have app for electricians
- 👍 Love These
- 👍 Electrical Engineer

**What reviewers complain about**

- 🐛 Motor starting Voltage drop
- 🐛 Useless!
- 🐛 Won't work
- 🐛 How to use
- 🐛 Confused

**Reported bugs**

- Useless!
- Won't work
- How to use
- Confused
- Bad app

**Requested features**

- Motor starting Voltage drop calculation
- Metric wire size options


### BinMaster Sensor App

[App page](https://appshunter.io/ios/app/binmaster-sensor-app/id6478102938)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Southwire® Voltage Drop Calc free?

Southwire® Voltage Drop Calc is free to download, with no in-app purchases.

### Is BinMaster Sensor App free?

BinMaster Sensor App is free to download, with no in-app purchases.

### Do Southwire® Voltage Drop Calc or BinMaster Sensor App have ads?

Neither Southwire® Voltage Drop Calc nor BinMaster Sensor App shows ads.

### Which is updated more often, Southwire® Voltage Drop Calc or BinMaster Sensor App?

Southwire® Voltage Drop Calc ships an update every 2 months, and BinMaster Sensor App every 9 months. Most recently, Southwire® Voltage Drop Calc was updated on September 17, 2026 and BinMaster Sensor App on September 17, 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.*