# Transformer Calculator. vs Panel Legend 2

The clearest difference is price: Transformer Calculator. at Free against Panel Legend 2's $6.99. Transformer Calculator. also leads on rating (4.8 vs 2.3) and ratings volume (47 vs 3). Panel Legend 2's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence and device support there is nothing between them.

Transformer Calculator. is free to download; Panel Legend 2 costs $6.99 up front. Transformer Calculator. sells 1 one-off in-app purchase. Panel Legend 2 asks for nothing beyond the download.

Transformer Calculator. holds the better App Store score, 4.8 against 2.3. That said, the two scores are not equally well evidenced: Transformer Calculator. has 47 ratings behind it against 3, so its average is the more settled of the two.

Transformer Calculator. ships an update every 4 months, Panel Legend 2 every 3 months. The most recent releases landed on September 18, 2026 and August 4, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | Panel Legend 2 |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| Rating | **[4.8 (47 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/panel-legend-2/id1569692089/reviews) |
| Number of ratings | **47** | 3 |
| Positive reviews | — | 14.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 41 MB | 19 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## 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 |


### Panel Legend 2

[App page](https://appshunter.io/ios/app/panel-legend-2/id1569692089)

Easily create professional panel legends for any project size. This universal app supports multiple devices and offers features like iCloud sync, PDF export, and color-coded circuit numbers. It also includes helpful construction calculators.

**Highlights:** Create legends of any size, iCloud support for cross-device sync, Export legends as PDF, Color-coded circuit numbers, Construction style calculator included, Supports inches or centimeters

**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 Panel Legend 2 free?

Panel Legend 2 costs $6.99, with no in-app purchases.

### Which has better reviews, Transformer Calculator. or Panel Legend 2?

Transformer Calculator. is rated higher. Transformer Calculator. averages 4.8 out of 5 from 47 ratings, while Panel Legend 2 averages 2.3 from 3 ratings.

### Do Transformer Calculator. or Panel Legend 2 have ads?

Transformer Calculator. shows ads; Panel Legend 2 does not.

### Which is updated more often, Transformer Calculator. or Panel Legend 2?

Transformer Calculator. ships an update every 4 months, and Panel Legend 2 every 3 months. Most recently, Transformer Calculator. was updated on September 18, 2026 and Panel Legend 2 on August 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.*