# Transformer Calculator. vs Watch Identifier

The clearest difference is in-app purchases: Watch Identifier at none against Transformer Calculator.'s 1. Watch Identifier also leads on ads (none vs shown) and update cadence (every 4 days vs every 4 months). Transformer Calculator.'s advantage is ratings volume (49 vs 8). On price, rating, device support and iOS requirement there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for Transformer Calculator. against 4.9 for Watch Identifier. That said, the two scores are not equally well evidenced: Transformer Calculator. has 49 ratings behind it against 8, so its average is the more settled of the two.

Transformer Calculator. ships an update every 4 months, Watch Identifier every 4 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | Watch Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (49 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews) | **[4.9 (8 ratings)](https://appshunter.io/ios/app/watch-identifier/id6760492071/reviews)** |
| Number of ratings | **49** | 8 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 4 MB |
| Requires iOS | 17.6 | **17** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Kawaii](https://appshunter.io/developer/1696001381) |

## 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 |


### Watch Identifier

[App page](https://appshunter.io/ios/app/watch-identifier/id6760492071)

Identify watches from photos using advanced AI. Get detailed information on brand, model, movement, value, and history. Save your discoveries and explore a global collection.

**Highlights:** AI-powered watch recognition, Detailed watch information, Estimated market value, Personal watch collection, Community showcase, Care and maintenance tips

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

**In-app purchases:** none


## Frequently asked questions

### Is Transformer Calculator. free?

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

### Is Watch Identifier free?

Watch Identifier is free to download, with no in-app purchases.

### Which has better reviews, Transformer Calculator. or Watch Identifier?

Watch Identifier is rated higher. Transformer Calculator. averages 4.8 out of 5 from 49 ratings, while Watch Identifier averages 4.9 from 8 ratings.

### Do Transformer Calculator. or Watch Identifier have ads?

Transformer Calculator. shows ads; Watch Identifier does not.

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

Transformer Calculator. ships an update every 4 months, and Watch Identifier every 4 days. Most recently, Transformer Calculator. was updated on October 27, 2026 and Watch Identifier on October 24, 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.*