# MasterElec vs Voltage Calculator

The clearest difference is in-app purchases: Voltage Calculator at none against MasterElec's 2. Voltage Calculator also leads on update cadence (every 2 weeks vs every 3 months) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. MasterElec sells 2 in-app purchases, starting at $4.99 per 7 days. Voltage Calculator asks for nothing beyond the download.

MasterElec ships an update every 3 months, Voltage Calculator every 2 weeks. The most recent releases landed on September 23, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | MasterElec | Voltage Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/masterelec-nec-code-guide/id6760912109/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Freemium | — |
| Size | 28 MB | 72 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TWOSCRIPTS LABS INC.](https://appshunter.io/developer/1861222980) | [ESDEV Teknoloji](https://appshunter.io/developer/1693053468) |

## What reviewers say

### MasterElec

[App page](https://appshunter.io/ios/app/masterelec-nec-code-guide/id6760912109)

A voice-powered assistant for electricians that provides offline access to NEC references and professional calculators. Quickly get answers to code questions and perform calculations without needing an internet connection.

**Highlights:** Voice-first interface for queries, 100% offline functionality, NEC reference access, Professional electrical calculators, Bookmark and export calculations, Free daily voice queries

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Susbcription | $4.99 | per 7 days |
| Annual Subscription | $39.99 | per year |


### 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 MasterElec free?

MasterElec 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 MasterElec or Voltage Calculator have ads?

Neither MasterElec nor Voltage Calculator shows ads.

### Which is updated more often, MasterElec or Voltage Calculator?

MasterElec ships an update every 3 months, and Voltage Calculator every 2 weeks. Most recently, MasterElec was updated on September 23, 2026 and Voltage Calculator on September 15, 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.*