wallpaper engine is malware.

[76561199501116053]

They steal your information.

[Azza ☠]

The Wallpaper Engine app itself is fine.

Using an unapproved "app" type wallpapers could be a risk. Such as a Web-based Wallpaper could contain online ads. That ad could then possibly try to inject malware, just like if you where visiting a website.

The Wallpaper Engine would warn you if you open anything it can't guarantee as safe, so would be at your own risk.

Ideally, you should be running an anti-virus either way, with or without the Wallpaper Engine app.

Developers comment:
"Yes, the wallpapers are safe and we take security very seriously. Wallpaper Engine supports four wallpaper types: Scenes, Videos, Web-based wallpapers and application wallpapers. The only real threat can come from application wallpapers, however, these wallpapers are very rare and we provide a big warning that cannot be missed the first time you run a specific application wallpaper. Even then, we have not heard of any application-based wallpapers containing malicious code.

Again, out of the roughly 700,000 free wallpapers that exist right now, there are only 2000 application wallpapers, so it's unlikely you will download one in the first place. If you create your own wallpapers (with the built-in editor for example), these will obviously also be safe."

You could avoid web/app Wallpapers, create your own, or only use the listed "verified" Wallpapers to stay extra safe. The verified ones have been fully checked.