# Electrical Formulator vs Diary Books

The clearest difference is update cadence: Diary Books at every 10 days against Electrical Formulator's every 2 months. On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Electrical Formulator sells 1 one-off in-app purchase and Diary Books 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, Diary Books every 10 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Electrical Formulator | Diary Books |
| --- | --- | --- |
| 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** | 8.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 16 MB | 4 MB |
| Requires iOS | 18.4 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Alteru Inc.](https://appshunter.io/developer/434747758) |

## 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 |


### Diary Books

[App page](https://appshunter.io/ios/app/diary-books/id353283040)

Record daily memories, thoughts, and special moments in a beautifully designed personal journal. Organize entries into distinct diary books for different life events, people, or goals. This app offers a private and simple space to capture your life stories and revisit cherished memories.

**Highlights:** Create multiple diary books, Write daily journal entries, Organize memories by year, topic, or person, Elegant diary-book design, Face ID support, Private journaling space

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diary Books App Purchase | $4.99 | one-time |


## Frequently asked questions

### Is Electrical Formulator free?

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

### Is Diary Books free?

Diary Books is free to download, with in-app purchases available.

### Do Electrical Formulator or Diary Books have ads?

Neither Electrical Formulator nor Diary Books shows ads.

### Which is updated more often, Electrical Formulator or Diary Books?

Electrical Formulator ships an update every 2 months, and Diary Books every 10 days. Most recently, Electrical Formulator was updated on October 23, 2026 and Diary Books on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*