# Windmill Pro vs Sound Meter

The clearest difference is in-app purchases: Windmill Pro at none against Sound Meter's 3. Windmill Pro also leads on device support (3 vs 1) and iOS requirement (9.3 vs 26.0). Sound Meter's advantage is update cadence (fortnightly vs every 12 months). On price and ads there is nothing between them.

Both are free to download. Sound Meter sells 3 in-app purchases, starting at $0.99 per month. Windmill Pro asks for nothing beyond the download.

Windmill Pro ships an update every 12 months, Sound Meter fortnightly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Windmill Pro | Sound Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/windmill-pro/id1309388375/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 12 MB | 5 MB |
| Requires iOS | **9.3** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DIGISINE ENERGYTECH CO.,LTD.](https://appshunter.io/developer/1541781655) | [Sergey Kushner](https://appshunter.io/developer/1357054898) |

## What reviewers say

### Windmill Pro

[App page](https://appshunter.io/ios/app/windmill-pro/id1309388375)

Monitor your Automaxx Windmill wind turbines directly from your smartphone. Track operational data and status via Bluetooth, including voltage, charge levels, and generation metrics.

**Highlights:** Monitor wind turbine operation, Track functional data, View operating status, Bluetooth connectivity, Generating Voltage, Battery Charge Level Indicator, Brake/Unbrake control

**In-app purchases:** none


### Sound Meter

[App page](https://appshunter.io/ios/app/sound-meter-noise-level-db/id6763905136)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $0.99 | per month |
| Year | $2.99 | per year |
| Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is Windmill Pro free?

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

### Is Sound Meter free?

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

### Do Windmill Pro or Sound Meter have ads?

Neither Windmill Pro nor Sound Meter shows ads.

### Which is updated more often, Windmill Pro or Sound Meter?

Windmill Pro ships an update every 12 months, and Sound Meter fortnightly. Most recently, Windmill Pro was updated on November 2, 2026 and Sound Meter on October 31, 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.*