The best alternatives to Popularr are Unfiltered.news, News API , and NewsBot. If these 3 options don't work for you, we've listed a few more alternatives below.
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Developed at MIT, Acciyo is a Google Chrome Extension that uses NLP to populate a timeline of previous articles published on the news subject you’re currently reading, kind of like the previous "chapters" of a news story.
unvisited.io lets you create a custom news feed with content from your favourite sites, podcasts and YouTube channels. Organize feeds with tags, Enjoy multiple layout views, Sync feeds automatically or manually, Add articles to a Read later list.