It's a downloadable binary that, as per their FAQ, uses their servers for the actual font ID... and yet there's no web version. Leaving aside malicious intent, I can't think of any reason to do it this way except to conceal the client-server API. And that's strange.

Also weird that there's no company or developer details. Whois for the domain is cloaked. The site is behind Cloudflare, but it looks it's hosted on alibabacloud error, at least partially. And the whole thing is free.

No idea if the file is signed, but won't be surprised if it's not.

I don't see many people finding an installable client for a font ID service from an unnamed developer striving to remain anonymous to be an appealing proposition.