# OCS vs Electric Master

The clearest difference is in-app purchases: OCS at none against Electric Master's 3. OCS also leads on iOS requirement (15.6 vs 17.0). Electric Master's advantage is update cadence (every 2 weeks vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Electric Master sells 3 in-app purchases, starting at $9.99 per month. OCS asks for nothing beyond the download.

OCS ships an update every 6 months, Electric Master every 2 weeks. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OCS | Electric Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.6 (5 ratings)](https://appshunter.io/ios/app/electric-master-nec-panel/id6760935722/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 27 MB | 72 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ojmar Intelligent Locking Systems](https://appshunter.io/developer/1353773747) | [Yusuf Can Samiloglu](https://appshunter.io/developer/1863275820) |

## What reviewers say

### OCS

[App page](https://appshunter.io/ios/app/ocs-maintenance/id1548447958)

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

**In-app purchases:** none


### Electric Master

[App page](https://appshunter.io/ios/app/electric-master-nec-panel/id6760935722)

This app provides a suite of electrical calculation tools for professionals, offering NEC-compliant solutions for wire sizing, voltage drop, and more. It works offline and allows for PDF export of results with custom branding.

**Highlights:** NEC-compliant electrical calculators, Offline functionality, Voltage drop calculations, Ampacity and wire sizing, PDF export with branding, Calculation history, Siri Shortcuts integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly — All Calculators | $9.99 | per month |
| Pro Yearly — All Calculators | $59.99 | per year |
| Pro Lifetime — All Calculators | $119.99 | one-time |


## Frequently asked questions

### Is OCS free?

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

### Is Electric Master free?

Electric Master is free to download, with in-app purchases available.

### Do OCS or Electric Master have ads?

Neither OCS nor Electric Master shows ads.

### Which is updated more often, OCS or Electric Master?

OCS ships an update every 6 months, and Electric Master every 2 weeks. Most recently, OCS was updated on October 29, 2026 and Electric Master on October 24, 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.*