# Electrical Formulator vs TVS Diode Array Product Selector

Electrical Formulator and TVS Diode Array Product Selector both sit at 5.0 stars, but that hides the real split: 100% of TVS Diode Array Product Selector's written reviews are positive against 15% of Electrical Formulator's. TVS Diode Array Product Selector also leads on in-app purchases (none vs 1) and iOS requirement (8.4 vs 18.4). Electrical Formulator's advantage is update cadence (every 2 months vs every 6 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Electrical Formulator sells 1 one-off in-app purchase. TVS Diode Array Product Selector asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Electrical Formulator against 5.0 for TVS Diode Array Product Selector. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 15% of Electrical Formulator's written reviews are positive against 100% of TVS Diode Array Product Selector's.

Electrical Formulator ships an update every 2 months, TVS Diode Array Product Selector every 6 months. The most recent releases landed on October 6, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Electrical Formulator | TVS Diode Array Product Selector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/electrical-formulator/id299749412/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/tvs-diode-array-product-selector/id438716133/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 15.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Freemium | **Free** |
| Size | 16 MB | 8 MB |
| Requires iOS | 18.4 | **8.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Littelfuse, Inc.](https://appshunter.io/developer/503818127) |

## What reviewers say

### Electrical Formulator

[App page](https://appshunter.io/ios/app/electrical-formulator/id299749412)

This app provides a comprehensive suite of electrical calculation tools for design and engineering challenges. It offers hundreds of conversion and calculation options, with features to save, print, and email results. Easily access frequently used and recently accessed formulas, with all calculations automatically stored.

**Highlights:** Over 100 electrical formulas, Save and organize results, Share results via email or print, Access most-used and recent formulas, Supports US/Imperial and metric units, Formula categories for batteries, motors, transformers, and more

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Features For Electrcial | $1.99 | one-time |


### TVS Diode Array Product Selector

[App page](https://appshunter.io/ios/app/tvs-diode-array-product-selector/id438716133)

This app helps you find the right TVS Diode Array for your electronic circuits. It asks a few questions about your application to recommend the best product for ESD and lightning surge protection. You can also request samples and access datasheets.

**Highlights:** Product recommendation based on application needs, Sample requests, View product information and characteristics, Download datasheets, Access design resources

**In-app purchases:** none


## Frequently asked questions

### Is Electrical Formulator free?

Electrical Formulator is free to download, with in-app purchases available.

### Is TVS Diode Array Product Selector free?

TVS Diode Array Product Selector is free to download, with no in-app purchases.

### Which has better reviews, Electrical Formulator or TVS Diode Array Product Selector?

Electrical Formulator and TVS Diode Array Product Selector are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Electrical Formulator or TVS Diode Array Product Selector have ads?

Neither Electrical Formulator nor TVS Diode Array Product Selector shows ads.

### Which is updated more often, Electrical Formulator or TVS Diode Array Product Selector?

Electrical Formulator ships an update every 2 months, and TVS Diode Array Product Selector every 6 months. Most recently, Electrical Formulator was updated on October 6, 2026 and TVS Diode Array Product Selector on September 30, 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.*