ChatInDoc
FreemiumChatInDoc is a PDF viewer built on OpenAI's ChatGPT that lets you converse with your documents. It targets long, dense PDFs — academic papers, detailed reports, instruction manuals — and lets you ask questions directly in a chat interface. The AI summarizes sections, explains difficult terms, and analyzes entire reports. It runs on GPT-3.5 and GPT-4 and supports multiple languages.