# E vs Transformer Calc 2

The clearest difference is price: E at Free against Transformer Calc 2's $3.99. E also leads on rating (5.0 vs 1.0) and iOS requirement (13.0 vs 26.0). Transformer Calc 2's advantage is update cadence (every 2 months vs every 18 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

E is free to download; Transformer Calc 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

E holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

E ships an update every 18 months, Transformer Calc 2 every 2 months. The most recent releases landed on September 12, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | E | Transformer Calc 2 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/e-wire-calc/id885429495/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/transformer-calc-2/id1597015791/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 16 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ELEKTRISOLA](https://appshunter.io/developer/885429498) | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-wire-calc/id885429495)

This tool helps determine technical characteristics of enamelled copper wire based on industry standards. It offers functions for diameter conversion, resistance calculations, and breakdown voltage.

**Highlights:** Diameter conversion (mm, inch, AWG), Resistance calculation, Metal wire diameter calculation, Resistance tolerance, Enamelled copper quantity and length, Breakdown voltage, Winding tension calculation, Overall diameter tolerance

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

**In-app purchases:** none


### Transformer Calc 2

[App page](https://appshunter.io/ios/app/transformer-calc-2/id1597015791)

This app provides electricians with instant transformer sizing and advanced construction math, compliant with both US (NEC 2023) and Canadian (CEC 2024) electrical codes. It simplifies complex calculations for wire, conduit, and overcurrent protection, and includes a fractional construction calculator.

**Highlights:** Dual code compliance (NEC 2023, CEC 2024), Instant transformer sizing, Wire and conduit sizing, Overcurrent protection calculation, Fractional construction calculator, Unit conversion, Dark mode support

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

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is Transformer Calc 2 free?

Transformer Calc 2 costs $3.99, with no in-app purchases.

### Which has better reviews, E or Transformer Calc 2?

E is rated higher. E averages 5.0 out of 5 from 1 ratings, while Transformer Calc 2 averages 1.0 from 1 ratings.

### Do E or Transformer Calc 2 have ads?

Neither E nor Transformer Calc 2 shows ads.

### Which is updated more often, E or Transformer Calc 2?

E ships an update every 18 months, and Transformer Calc 2 every 2 months. Most recently, E was updated on September 12, 2026 and Transformer Calc 2 on October 5, 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.*