# Flyback Transformer Designer vs VoltSize

The clearest difference is in-app purchases: VoltSize at none against Flyback Transformer Designer's 1. Flyback Transformer Designer's advantage is ads (none vs shown) and device support (4 vs 2). On price and iOS requirement there is nothing between them.

Both are free to download. Flyback Transformer Designer sells 1 in-app purchase, starting at $29.99 per year. VoltSize asks for nothing beyond the download.

## The numbers

| Metric | Flyback Transformer Designer | VoltSize |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | — |
| Size | 8 MB | 46 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [建忠 徐](https://appshunter.io/developer/1871049057) | [Emin Burak YILDIRIM](https://appshunter.io/developer/1857921914) |

## What reviewers say

### Flyback Transformer Designer

[App page](https://appshunter.io/ios/app/flyback-transformer-designer/id6771727431)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual subscription | $29.99 | per year |


### VoltSize

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Flyback Transformer Designer free?

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

### Is VoltSize free?

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

### Do Flyback Transformer Designer or VoltSize have ads?

VoltSize shows ads; Flyback Transformer Designer 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.*