KeepFlash is an AI knowledge library that lets users save webpages, PDFs, YouTube videos, files, and notes into a single searchable workspace. It supports PDF annotations, AI-powered auto-tagging, and Topic Pages with an Auto Wiki feature that organizes saved research into structured summaries. Users can ask questions and receive source-linked answers drawn from their personal library. KeepFlash offers a free tier with 150 notes, 500 MB storage, and 200 AI credits per month, with paid plans available for expanded access.