GistNode is an AI-powered PDF reader that helps you instantly understand complex content. Highlight any text and get simple explanations, summaries, or deeper insights - right where you read. No copy-paste. No switching between apps. No broken focus. Just smooth, uninterrupted reading. GistNode provides Kindle-like experience with built-in AI, smart highlights, and shareable knowledge cards. Built for students, professionals, book lovers and curious minds who want to learn faster.