MyMemo gathers the articles, documents and links you save and makes the collection answerable, so a question returns something from your own material rather than from the open web. The saving is not the hard part of a second brain; the retrieval is, and most collections quietly become write-only.
Handling several content types matters, since useful things arrive as web pages, PDFs and notes, and a tool covering only one of those leaves most of the collection outside the system.
Pricing is published from a free tier through $5.90 to $19.90. Answers still need checking against the saved source, and the value depends entirely on saving consistently enough for the collection to be worth asking.
