In absolute terms, if these tools are useful to you then you most likely make enough that $25 is an inconsequential amount of money.
But relatively speaking, with 1) no way to preview functionality; 2) no way to preview code for quality; 3) the inability to get a full refund if they turn out to be garbage; 4) having to download executable instead of just running them in a browser (even though they're apparently written as web apps); and, 5) not having any idea who this person is, it's a big ask.
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In absolute terms, if these tools are useful to you then you most likely make enough that $25 is an inconsequential amount of money.
But relatively speaking, with 1) no way to preview functionality; 2) no way to preview code for quality; 3) the inability to get a full refund if they turn out to be garbage; 4) having to download executable instead of just running them in a browser (even though they're apparently written as web apps); and, 5) not having any idea who this person is, it's a big ask.