# 7909 Certification vs Voltage Drop Calculators

The clearest difference is price: 7909 Certification at Free against Voltage Drop Calculators's $3.99. 7909 Certification also leads on rating (5.0 vs 4.0) and update cadence (every 3 months vs every 7 months). Voltage Drop Calculators's advantage is in-app purchases (none vs 3) and ratings volume (4 vs 1). On ads and device support there is nothing between them.

7909 Certification is free to download; Voltage Drop Calculators costs $3.99 up front. 7909 Certification sells 3 one-off in-app purchases. Voltage Drop Calculators asks for nothing beyond the download.

7909 Certification holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

7909 Certification ships an update every 3 months, Voltage Drop Calculators every 7 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | 7909 Certification | Voltage Drop Calculators |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/7909-certification/id1544521777/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/voltage-drop-calculators/id6464050324/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | **Free** | Paid |
| Size | 6 MB | 67 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### 7909 Certification

[App page](https://appshunter.io/ios/app/7909-certification/id1544521777)

This app generates digital electrical certification forms for temporary installations based on BS 7909. It allows for easy creation, saving, emailing, and printing of completion certificates, test results, and confirmations. Features include data import/export, local backup, and automatic calculations for PSSC and G3 forms.

**Highlights:** Generate BS 7909 completion certificates, Save, print, or email PDF certificates, Import/export system data between devices, Local backup and restore functionality, Automatic PSSC calculation and G3 generation, Offline work capability, Customizable company logo and colors

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 Credits | $59.99 | one-time |
| 200 Credits | $99.99 | one-time |
| 300 Credits | $119.99 | one-time |


### Voltage Drop Calculators

[App page](https://appshunter.io/ios/app/voltage-drop-calculators/id6464050324)

This tool helps electrical professionals and students perform quick and accurate voltage drop calculations. It features a user-friendly interface, a material database, and the ability to save circuit details for efficient system design and compliance.

**Highlights:** Fast voltage drop calculations, Built-in material database, Custom material support, Save circuit details, Unit conversion, Recommended wire size guidance

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

**In-app purchases:** none


## Frequently asked questions

### Is 7909 Certification free?

7909 Certification is free to download, with in-app purchases available.

### Is Voltage Drop Calculators free?

Voltage Drop Calculators costs $3.99, with no in-app purchases.

### Which has better reviews, 7909 Certification or Voltage Drop Calculators?

7909 Certification is rated higher. 7909 Certification averages 5.0 out of 5 from 1 ratings, while Voltage Drop Calculators averages 4.0 from 4 ratings.

### Do 7909 Certification or Voltage Drop Calculators have ads?

Neither 7909 Certification nor Voltage Drop Calculators shows ads.

### Which is updated more often, 7909 Certification or Voltage Drop Calculators?

7909 Certification ships an update every 3 months, and Voltage Drop Calculators every 7 months. Most recently, 7909 Certification was updated on November 3, 2026 and Voltage Drop Calculators on November 3, 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.*