# Wind Power Calculator vs KSTAR Sync

The clearest difference is price: KSTAR Sync at Free against Wind Power Calculator's $2.99. KSTAR Sync also leads on update cadence (every 2 weeks vs every 29 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

KSTAR Sync is free to download; Wind Power Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Wind Power Calculator ships an update every 29 months, KSTAR Sync every 2 weeks. Both last shipped on September 15, 2026.

## The numbers

| Metric | Wind Power Calculator | KSTAR Sync |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wind-power-calculator/id907350151/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 74 MB |
| Requires iOS | **13** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Shenzhen Kstar Science & Technology Co., Ltd.](https://appshunter.io/developer/1460236605) |

## What reviewers say

### Wind Power Calculator

[App page](https://appshunter.io/ios/app/wind-power-calculator/id907350151)

Estimate the power output of a windmill using key factors like air density, windmill efficiency, cross-sectional area, and wind velocity. Understand how wind speed significantly impacts energy generation and calculate year-round energy production for informed decisions.

**Highlights:** Estimate available wind power, Calculate power based on key factors, Understand wind velocity impact, Calculate year-round energy generation, Unlock wind energy potential

**Features:** macOS Compatibility

**In-app purchases:** none


### KSTAR Sync

[App page](https://appshunter.io/ios/app/kstar-sync/id6754310380)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wind Power Calculator free?

Wind Power Calculator costs $2.99, with no in-app purchases.

### Is KSTAR Sync free?

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

### Do Wind Power Calculator or KSTAR Sync have ads?

Neither Wind Power Calculator nor KSTAR Sync shows ads.

### Which is updated more often, Wind Power Calculator or KSTAR Sync?

Wind Power Calculator ships an update every 29 months, and KSTAR Sync every 2 weeks. Most recently, Wind Power Calculator was updated on September 15, 2026 and KSTAR Sync on September 15, 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.*