# Transformer Calculator. vs Power Conversion Calc

The clearest difference is in-app purchases: Power Conversion Calc at none against Transformer Calculator.'s 1. Power Conversion Calc also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

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

Transformer Calculator. ships an update every 4 months, Power Conversion Calc every 3 months. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | Power Conversion Calc |
| --- | --- | --- |
| 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 | **No** |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 6 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Southwire Company](https://appshunter.io/developer/440338423) |

## 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 |


### Power Conversion Calc

[App page](https://appshunter.io/ios/app/power-conversion-calc/id6483929959)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Transformer Calculator. free?

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

### Is Power Conversion Calc free?

Power Conversion Calc is free to download, with no in-app purchases.

### Do Transformer Calculator. or Power Conversion Calc have ads?

Transformer Calculator. shows ads; Power Conversion Calc does not.

### Which is updated more often, Transformer Calculator. or Power Conversion Calc?

Transformer Calculator. ships an update every 4 months, and Power Conversion Calc every 3 months. Most recently, Transformer Calculator. was updated on October 10, 2026 and Power Conversion Calc on October 16, 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.*