# KNX Pro Tester vs FreeWillow

The clearest difference is price: FreeWillow at Free against KNX Pro Tester's $17.99. FreeWillow also leads on iOS requirement (15.1 vs 26.4). KNX Pro Tester's advantage is update cadence (every 3 days vs fortnightly). On ads, in-app purchases and device support there is nothing between them.

FreeWillow is free to download; KNX Pro Tester costs $17.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KNX Pro Tester ships an update every 3 days, FreeWillow fortnightly. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | KNX Pro Tester | FreeWillow |
| --- | --- | --- |
| Price | $17.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Size | 225 MB | 53 MB |
| Requires iOS | 26.4 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Davide Grandeppieno](https://appshunter.io/developer/908961846) | [Wesley Lorrez](https://appshunter.io/developer/6800407628) |

## What reviewers say

### KNX Pro Tester

[App page](https://appshunter.io/ios/app/knx-pro-tester/id6751961044)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none


### FreeWillow

[App page](https://appshunter.io/ios/app/freewillow/id6800407626)

**In-app purchases:** none


## Frequently asked questions

### Is KNX Pro Tester free?

KNX Pro Tester costs $17.99, with no in-app purchases.

### Is FreeWillow free?

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

### Do KNX Pro Tester or FreeWillow have ads?

Neither KNX Pro Tester nor FreeWillow shows ads.

### Which is updated more often, KNX Pro Tester or FreeWillow?

KNX Pro Tester ships an update every 3 days, and FreeWillow fortnightly. Most recently, KNX Pro Tester was updated on November 5, 2026 and FreeWillow on November 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*