# Windmill Propane vs Signal Sleuth

The clearest difference is in-app purchases: Windmill Propane at none against Signal Sleuth's 3. Windmill Propane also leads on device support (3 vs 1) and iOS requirement (12.2 vs 18.0). Signal Sleuth's advantage is update cadence (daily vs every 23 months). On price and ads there is nothing between them.

Both are free to download. Signal Sleuth sells 3 in-app purchases, starting at $1.99 per 7 days. Windmill Propane asks for nothing beyond the download.

Windmill Propane ships an update every 23 months, Signal Sleuth daily. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Windmill Propane | Signal Sleuth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/signal-sleuth/id6760551754/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Daily** |
| Monetization | — | Freemium |
| Size | 46 MB | 4 MB |
| Requires iOS | **12.2** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [EDPO, LLC](https://appshunter.io/developer/1521548149) | [LUKE WILLIAM ROACH](https://appshunter.io/developer/1880244380) |

## What reviewers say

### Windmill Propane

[App page](https://appshunter.io/ios/app/windmill-propane/id1583996012)

**Features:** macOS Compatibility

**In-app purchases:** none


### Signal Sleuth

[App page](https://appshunter.io/ios/app/signal-sleuth/id6760551754)

Locate nearby Bluetooth Low Energy devices and identify your own. The app offers a free passive scanning mode and a VIP finder mode for focused targeting with signal guidance. Unlock advanced features like manual probing and custom rules with a subscription.

**Highlights:** Passive BLE scanning, Targeted finder mode, Warming/cooling signal guidance, Manual probing, Custom rule imports, VIP subscription for advanced features

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Weekly | $1.99 | per 7 days |
| VIP Monthly | $5.99 | per month |
| VIP Yearly | $39.99 | per year |


## Frequently asked questions

### Is Windmill Propane free?

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

### Is Signal Sleuth free?

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

### Do Windmill Propane or Signal Sleuth have ads?

Neither Windmill Propane nor Signal Sleuth shows ads.

### Which is updated more often, Windmill Propane or Signal Sleuth?

Windmill Propane ships an update every 23 months, and Signal Sleuth daily. Most recently, Windmill Propane was updated on October 27, 2026 and Signal Sleuth on October 28, 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.*