# 2017 Master Electrician Ref. vs Safer Air

The clearest difference is price: Safer Air at Free against 2017 Master Electrician Ref.'s $9.99. 2017 Master Electrician Ref.'s advantage is device support. On in-app purchases and iOS requirement there is nothing between them.

Safer Air is free to download; 2017 Master Electrician Ref. costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 2017 Master Electrician Ref. | Safer Air |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.7 (1.3K ratings)](https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959/reviews)** | — |
| Number of ratings | **1.3K** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 5 months | — |
| Monetization | Paid | — |
| Size | 46 MB | 39 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 12+ | 4+ |
| Developer | [PawEng, LLC](https://appshunter.io/developer/390058606) | [KFM247, LTD](https://appshunter.io/developer/1372848997) |

## What reviewers say

### 2017 Master Electrician Ref.

[App page](https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959)

This digital handbook provides electricians and related professionals with essential electrical formulas, diagrams, and reference tables. It offers calculations, a dictionary of terms, and detailed information on wiring, motors, transformers, and more, all accessible on a mobile device.

**Highlights:** Electrical formulas and calculations, Wiring diagrams for various systems, Motor and transformer specifications, Conductor and ampacity tables, Dictionary of electrician terms, NEMA standards and diagrams, Math and conversion tools

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

**In-app purchases:** none

**What reviewers like**

- 👍 Quick reference
- 🚀 Best app for electrical information
- 🚀 Concise and well-laid out information
- 🚀 Comprehensive electrical references

**What reviewers complain about**

- 🐛 App needs to be updated
- 🐛 Inaccurate information in some areas
- 🐛 Limited functionality compared to expectations
- 🐛 Overlapping table of contents

**Reported bugs**

- Conduit fill information missing for certain types
- Login screen freezes
- Compatibility issues with older devices

**Requested features**

- Update to latest NEC code
- Add calculation tools for conduit fill and voltage drop
- Improve user interface and navigation


### Safer Air

[App page](https://appshunter.io/ios/app/safer-air/id6467753555)

**In-app purchases:** none


## Frequently asked questions

### Is 2017 Master Electrician Ref. free?

2017 Master Electrician Ref. costs $9.99, with no in-app purchases.

### Is Safer Air free?

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

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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.*