# Electrical Formulator vs Spindle Dynamics Studio

The clearest difference is in-app purchases: Spindle Dynamics Studio at none against Electrical Formulator's 1. Spindle Dynamics Studio also leads on iOS requirement (13.0 vs 18.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Electrical Formulator sells 1 one-off in-app purchase. Spindle Dynamics Studio asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 23, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Electrical Formulator | Spindle Dynamics Studio |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Freemium | — |
| Size | 16 MB | 107 MB |
| Requires iOS | 18.4 | **13.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Sens-OS](https://appshunter.io/developer/1533837951) |

## 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 |


### Spindle Dynamics Studio

[App page](https://appshunter.io/ios/app/spindle-dynamics-studio/id1661428624)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Electrical Formulator free?

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

### Is Spindle Dynamics Studio free?

Spindle Dynamics Studio is free to download, with no in-app purchases.

### Do Electrical Formulator or Spindle Dynamics Studio have ads?

Neither Electrical Formulator nor Spindle Dynamics Studio shows ads.

### Which is updated more often, Electrical Formulator or Spindle Dynamics Studio?

Electrical Formulator ships an update every 2 months, and Spindle Dynamics Studio every 2 months. Most recently, Electrical Formulator was updated on October 23, 2026 and Spindle Dynamics Studio on October 4, 2026.

---

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