# Transformer Calculation Tool vs VoltSize

The clearest difference is in-app purchases: VoltSize at none against Transformer Calculation Tool's 1. Transformer Calculation Tool's advantage is ads (none vs shown) and iOS requirement (13.0 vs 16.4). On price and device support there is nothing between them.

Both are free to download. Transformer Calculation Tool sells 1 one-off in-app purchase. VoltSize asks for nothing beyond the download.

## The numbers

| Metric | Transformer Calculation Tool | VoltSize |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | — |
| Size | 57 MB | 46 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) | [Emin Burak YILDIRIM](https://appshunter.io/developer/1857921914) |

## What reviewers say

### Transformer Calculation Tool

[App page](https://appshunter.io/ios/app/transformer-calculation-tool/id6772152007)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


### VoltSize

[App page](https://appshunter.io/ios/app/voltsize/id6795860156)

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

**In-app purchases:** none


## Frequently asked questions

### Is Transformer Calculation Tool free?

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

### Is VoltSize free?

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

### Do Transformer Calculation Tool or VoltSize have ads?

VoltSize shows ads; Transformer Calculation Tool does not.

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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.*