# Arc Flash Label Calculator vs Transformer Calculator.

The clearest difference is rating: Transformer Calculator. at 4.8 against Arc Flash Label Calculator's 3.5. Transformer Calculator. also leads on ratings volume (49 vs 6). Arc Flash Label Calculator's advantage is ads (none vs shown) and update cadence (fortnightly vs every 4 months). On price and in-app purchases there is nothing between them.

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

Transformer Calculator. holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: Transformer Calculator. has 49 ratings behind it against 6, so its average is the more settled of the two.

Arc Flash Label Calculator ships an update fortnightly, Transformer Calculator. every 4 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Arc Flash Label Calculator | Transformer Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (6 ratings)](https://appshunter.io/ios/app/arc-flash-label-calculator/id1363795374/reviews) | **[4.8 (49 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** |
| Number of ratings | 6 | **49** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 41 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Octagon Seven LLC](https://appshunter.io/developer/1200115862) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Arc Flash Label Calculator

[App page](https://appshunter.io/ios/app/arc-flash-label-calculator/id1363795374)

Calculate and generate arc flash labels for electrical equipment. Input data to produce PDF labels based on NFPA 70E standards, including incident energy and approach boundaries. Supports various circuit breakers, fuses, and voltage levels.

**Highlights:** Arc flash label calculation, NFPA 70E Annex D.4 methodology, Support for MCCB, ICCB, LSI, and fuses, Calculates Incident Energy, Arc Flash Boundary, Approach Boundaries, Generates PDF labels (4 per sheet), Supports low, medium, and high voltage equipment, Custom configurations for gap, distance, and time

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock High Voltage Arc Flash | $19.99 | one-time |


### 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 Arc Flash Label Calculator free?

Arc Flash Label Calculator is free to download, with in-app purchases available.

### Is Transformer Calculator. free?

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

### Which has better reviews, Arc Flash Label Calculator or Transformer Calculator.?

Transformer Calculator. is rated higher. Arc Flash Label Calculator averages 3.5 out of 5 from 6 ratings, while Transformer Calculator. averages 4.8 from 49 ratings.

### Do Arc Flash Label Calculator or Transformer Calculator. have ads?

Transformer Calculator. shows ads; Arc Flash Label Calculator does not.

### Which is updated more often, Arc Flash Label Calculator or Transformer Calculator.?

Arc Flash Label Calculator ships an update fortnightly, and Transformer Calculator. every 4 months. Most recently, Arc Flash Label Calculator 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.*