# Transformer Calculator. vs e

The clearest difference is in-app purchases: e at none against Transformer Calculator.'s 1. e also leads on iOS requirement (13.0 vs 17.6). Transformer Calculator.'s advantage is device support. On price there is nothing between them.

Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase. e asks for nothing beyond the download.

## The numbers

| Metric | Transformer Calculator. | e |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (48 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** | — |
| Number of ratings | **48** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 4 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 1 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Shijiazhuang Tonhe Electronics Technologies Co., Ltd.](https://appshunter.io/developer/1752035147) |

## What reviewers say

### Transformer Calculator.

[App page](https://appshunter.io/ios/app/transformer-calculator/id1506155081)

This app simplifies transformer calculations for engineers and students. It accurately computes primary and secondary currents, turns ratios, and secondary voltages based on user inputs for transformer ratings and winding turns.

**Highlights:** Primary and secondary current calculations, Turns ratio determination, Transformer type identification, Secondary voltage calculation, Supports 1Φ and 3Φ phases, User-friendly interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Pro | $3.99 | one-time |


### e

[App page](https://appshunter.io/ios/app/e-energy-plus/id6504376117)

**In-app purchases:** none


## Frequently asked questions

### Is Transformer Calculator. free?

Transformer Calculator. is free to download, with in-app purchases available.

### Is e free?

e is free to download, with no in-app purchases.

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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.*