# WONDER onSITE vs WindPower

The clearest difference is in-app purchases: WONDER onSITE at none against WindPower's 1. WONDER onSITE also leads on update cadence (fortnightly vs every 4 months) and iOS requirement (15.0 vs 18). On price, ads and device support there is nothing between them.

Both are free to download. WindPower sells 1 in-app purchase, starting at $2.99 per month. WONDER onSITE asks for nothing beyond the download.

WONDER onSITE ships an update fortnightly, WindPower every 4 months. The most recent releases landed on September 24, 2026 and June 8, 2026 respectively.

## The numbers

| Metric | WONDER onSITE | WindPower |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | — | Subscription |
| Size | 27 MB | 8 MB |
| Requires iOS | **15.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Deutsche WindGuard Systems GmbH](https://appshunter.io/developer/1542965155) | [Christian Schlee](https://appshunter.io/developer/1784094642) |

## What reviewers say

### WONDER onSITE

[App page](https://appshunter.io/ios/app/wonder-onsite/id1542965153)

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

**In-app purchases:** none


### WindPower

[App page](https://appshunter.io/ios/app/windpower-app/id6739182378)

This app provides technicians and professionals in the wind energy sector with direct oversight of wind turbines in Germany. It offers tools for searching turbines, detailed weather forecasts, documentation, and safety checks to simplify daily work.

**Highlights:** Search 37,000+ wind turbines, 14-day weather forecast per turbine, Favorites and search history, Photo documentation and safety checks, Last Minute Risk Analyses (LMRA), Nm converter, Nearby points of interest

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $2.99 | per month |


## Frequently asked questions

### Is WONDER onSITE free?

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

### Is WindPower free?

WindPower is free to download, with in-app purchases available.

### Do WONDER onSITE or WindPower have ads?

Neither WONDER onSITE nor WindPower shows ads.

### Which is updated more often, WONDER onSITE or WindPower?

WONDER onSITE ships an update fortnightly, and WindPower every 4 months. Most recently, WONDER onSITE was updated on September 24, 2026 and WindPower on June 8, 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.*