# Transformer Calculator. vs Calculation Transformers

The clearest difference is ads: Calculation Transformers at none against Transformer Calculator.'s shown. Calculation Transformers also leads on iOS requirement (13.0 vs 17.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase and Calculation Transformers sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Transformer Calculator. ships an update every 4 months, Calculation Transformers every 5 months. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | Calculation Transformers |
| --- | --- | --- |
| 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 | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 56 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Nanjibhai Gorasiya](https://appshunter.io/developer/1834066312) |

## 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 |


### Calculation Transformers

[App page](https://appshunter.io/ios/app/calculation-transformers/id6759037556)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


## Frequently asked questions

### Is Transformer Calculator. free?

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

### Is Calculation Transformers free?

Calculation Transformers is free to download, with in-app purchases available.

### Do Transformer Calculator. or Calculation Transformers have ads?

Transformer Calculator. shows ads; Calculation Transformers does not.

### Which is updated more often, Transformer Calculator. or Calculation Transformers?

Transformer Calculator. ships an update every 4 months, and Calculation Transformers every 5 months. Most recently, Transformer Calculator. was updated on October 10, 2026 and Calculation Transformers 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.*