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Almost every knowledge tool competes on getting answers out, and leaves getting content in as manual work you do one item at a time. That is the whole difference: Opyt reads the saving, following and subscribing you already do, expands each person you confirm into their entire archive, and keeps pulling on the questions your reading raises.
Every page below says where the other tool is better first. Several of them are not competitors at all, and the page will say so.
The assistant you already have
Read-it-later & second brain
AI notebooks
Also in this category: ChatGPT Projects · Claude Projects · Perplexity Spaces
Platform AI
Also in this category: Meta AI · LinkedIn AI · Reddit Answers
Agent memory & connectors
Research
Bookmarks & archives