# Transformer Calculator. vs Garage Guard

The clearest difference is in-app purchases: Garage Guard at none against Transformer Calculator.'s 1. Garage Guard also leads on ads (none vs shown) and update cadence (every 3 days vs every 4 months). On price and device support there is nothing between them.

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

Transformer Calculator. ships an update every 4 months, Garage Guard every 3 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Transformer Calculator. | Garage Guard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (49 ratings)](https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews)** | — |
| Number of ratings | **49** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 211 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Guardian Shanghai Co., Ltd.](https://appshunter.io/developer/1501278197) |

## 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 |


### Garage Guard

[App page](https://appshunter.io/ios/app/garage-guard/id6443540632)

**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 Garage Guard free?

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

### Do Transformer Calculator. or Garage Guard have ads?

Transformer Calculator. shows ads; Garage Guard does not.

### Which is updated more often, Transformer Calculator. or Garage Guard?

Transformer Calculator. ships an update every 4 months, and Garage Guard every 3 days. Most recently, Transformer Calculator. was updated on November 4, 2026 and Garage Guard on October 30, 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.*