# Transformer Calculator Plus vs Transformer Calculator.

The clearest difference is price: Transformer Calculator. at Free against Transformer Calculator Plus's $2.99. Transformer Calculator. also leads on rating (4.8 vs 3.3) and update cadence (every 4 months vs every 45 months). Transformer Calculator Plus's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Transformer Calculator. is free to download; Transformer Calculator Plus costs $2.99 up front. Transformer Calculator. sells 1 one-off in-app purchase. Transformer Calculator Plus asks for nothing beyond the download.

Transformer Calculator. holds the better App Store score, 4.8 against 3.3. That said, the two scores are not equally well evidenced: Transformer Calculator. has 49 ratings behind it against 4, so its average is the more settled of the two.

Transformer Calculator Plus ships an update every 45 months, Transformer Calculator. every 4 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Transformer Calculator Plus | Transformer Calculator. |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.3 (4 ratings)](https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401/reviews) | **[4.8 (49 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** |
| Number of ratings | 4 | **49** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 45 months | **Every 4 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 41 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Transformer Calculator Plus

[App page](https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401)

This utility app calculates key parameters for transformers, including voltage, current, and turns ratio. It helps determine if a transformer is step-up or step-down, essential for power conversion applications.

**Highlights:** Calculate primary and secondary voltage, Calculate primary and secondary current, Calculate transformer turns ratio, Determine step-up or step-down transformer, Supports AC voltage calculations

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Transformer Calculator Plus free?

Transformer Calculator Plus costs $2.99, with no in-app purchases.

### Is Transformer Calculator. free?

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

### Which has better reviews, Transformer Calculator Plus or Transformer Calculator.?

Transformer Calculator. is rated higher. Transformer Calculator Plus averages 3.3 out of 5 from 4 ratings, while Transformer Calculator. averages 4.8 from 49 ratings.

### Do Transformer Calculator Plus or Transformer Calculator. have ads?

Transformer Calculator. shows ads; Transformer Calculator Plus does not.

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

Transformer Calculator Plus ships an update every 45 months, and Transformer Calculator. every 4 months. Most recently, Transformer Calculator Plus was updated on November 2, 2026 and Transformer Calculator. on November 4, 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.*