# Transformer Calculator. vs PLC Ninja

The clearest difference is ads: PLC Ninja at none against Transformer Calculator.'s shown. PLC Ninja also leads on update cadence (every 3 weeks vs every 4 months) and rating (5.0 vs 4.8). Transformer Calculator.'s advantage is ratings volume (49 vs 3). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase and PLC Ninja sells 6 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

PLC Ninja holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Transformer Calculator. has 49 ratings behind it against 3, so its average is the more settled of the two.

Transformer Calculator. ships an update every 4 months, PLC Ninja every 3 weeks. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | PLC Ninja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (49 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/plc-ninja/id6805188950/reviews)** |
| Number of ratings | **49** | 3 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 41 MB | 10 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [SHAOHUA YI](https://appshunter.io/developer/6805189132) |

## 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 |


### PLC Ninja

[App page](https://appshunter.io/ios/app/plc-ninja/id6805188950)

Access live PLC data directly from your mobile device. Connect via Ethernet, Wi-Fi, or serial adapter to monitor inputs, outputs, timers, counters, and analog values in real-time while in the field.

**Highlights:** Real-time PLC data monitoring, Ethernet, Wi-Fi, and serial connection support, View inputs and outputs, Monitor timers and counters, Access analog values

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $3.99 | per month |
| Professional | $8.99 | per month |
| Ultimate | $14.99 | per month |
| Standard | $39.99 | per year |
| Professional | $89.99 | per year |
| Ultimate | $149.99 | per year |


## Frequently asked questions

### Is Transformer Calculator. free?

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

### Is PLC Ninja free?

PLC Ninja is free to download, with in-app purchases available.

### Which has better reviews, Transformer Calculator. or PLC Ninja?

PLC Ninja is rated higher. Transformer Calculator. averages 4.8 out of 5 from 49 ratings, while PLC Ninja averages 5.0 from 3 ratings.

### Do Transformer Calculator. or PLC Ninja have ads?

Transformer Calculator. shows ads; PLC Ninja does not.

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

Transformer Calculator. ships an update every 4 months, and PLC Ninja every 3 weeks. Most recently, Transformer Calculator. was updated on October 27, 2026 and PLC Ninja on October 22, 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.*