# MyTWS vs Flyback Transformer Designer

The clearest difference is in-app purchases: MyTWS at none against Flyback Transformer Designer's 1. Flyback Transformer Designer's advantage is device support (4 vs 2). On price, update cadence, ads 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. MyTWS asks for nothing beyond the download.

MyTWS ships an update every 6 weeks, Flyback Transformer Designer every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | MyTWS | Flyback Transformer Designer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flyback-transformer-designer/id6771727431/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 81 MB | 8 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [TWS](https://appshunter.io/developer/1776848075) | [建忠 徐](https://appshunter.io/developer/1871049057) |

## What reviewers say

### MyTWS

[App page](https://appshunter.io/ios/app/mytws/id6737515196)

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

**In-app purchases:** none


### Flyback Transformer Designer

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

Design flyback transformers with detailed calculations for core, gap, turns, and wire gauge. Supports multiple operating modes and secondary outputs, with local computation and exportable reports. Offers a trial period followed by a one-time purchase.

**Highlights:** Complete transformer design calculations, Supports DCM, BCM, QR, and CCM modes, Multi-output secondary winding design, Core, gap, turns, and wire gauge iteration, Built-in ferrite core library, Exportable PDF and JSON reports, Local computation, no internet required

**In-app purchases (1)**

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


## Frequently asked questions

### Is MyTWS free?

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

### Is Flyback Transformer Designer free?

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

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

Neither MyTWS nor Flyback Transformer Designer shows ads.

### Which is updated more often, MyTWS or Flyback Transformer Designer?

MyTWS ships an update every 6 weeks, and Flyback Transformer Designer every 2 months. Most recently, MyTWS was updated on October 24, 2026 and Flyback Transformer Designer on October 25, 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.*