# Electrical Formulator vs Happier PDF

The clearest difference is update cadence: Happier PDF at every 3 days against Electrical Formulator's every 2 months. Happier PDF also leads on iOS requirement (16.0 vs 18.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Electrical Formulator sells 1 one-off in-app purchase and Happier PDF sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Electrical Formulator ships an update every 2 months, Happier PDF every 3 days. The most recent releases landed on October 6, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Electrical Formulator | Happier PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/electrical-formulator/id299749412/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 15.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 16 MB | 2 MB |
| Requires iOS | 18.4 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Thi Hong Chau Le](https://appshunter.io/developer/1610084014) |

## 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 |


### Happier PDF

[App page](https://appshunter.io/ios/app/happier-pdf/id6470315442)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Export PDF without limitation | $1.99 | one-time |


## Frequently asked questions

### Is Electrical Formulator free?

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

### Is Happier PDF free?

Happier PDF is free to download, with in-app purchases available.

### Do Electrical Formulator or Happier PDF have ads?

Neither Electrical Formulator nor Happier PDF shows ads.

### Which is updated more often, Electrical Formulator or Happier PDF?

Electrical Formulator ships an update every 2 months, and Happier PDF every 3 days. Most recently, Electrical Formulator was updated on October 6, 2026 and Happier PDF on October 1, 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.*