My personal knowledge base is hosted on GitHub at <a href="https://raphaelsty.github.io/knowledge/" rel="nofollow">https://raphaelsty.github.io/knowledge/</a>. It scans the documents I like every day using GitHub Action, Zotero, HackerNews upvote and Github Likes. It's not yet optimized for smartphones. It cost me $5 to host it for a year.