# Transformer Calculator. vs VFD Cable Sizing Calc

The clearest difference is in-app purchases: VFD Cable Sizing Calc at none against Transformer Calculator.'s 1. VFD Cable Sizing 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. VFD Cable Sizing Calc asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 18, 2026 and March 8, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | VFD Cable Sizing Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (47 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** | — |
| Number of ratings | **47** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 5 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| 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 |


### VFD Cable Sizing Calc

[App page](https://appshunter.io/ios/app/vfd-cable-sizing-calc/id6452802915)

**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 VFD Cable Sizing Calc free?

VFD Cable Sizing Calc is free to download, with no in-app purchases.

### Do Transformer Calculator. or VFD Cable Sizing Calc have ads?

Transformer Calculator. shows ads; VFD Cable Sizing Calc does not.

### Which is updated more often, Transformer Calculator. or VFD Cable Sizing Calc?

Transformer Calculator. ships an update every 4 months, and VFD Cable Sizing Calc every 4 months. Most recently, Transformer Calculator. was updated on September 18, 2026 and VFD Cable Sizing Calc on March 8, 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.*