Thanks for the tip, but honestly it's not in my "workflow" of reading HN to read the source site of the article.
I'll keep that in mind anyway because it can be useful.
Since it seems there is no mobile app doing that, one of the choices I have is to make a pull request for this feature in the Hacki repo, based on "Filter Keywords", the code should be pretty much the same.
Maybe it's best if I discuss it with the maintainer before.
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