Question: Can you recommend a service that uses AI to provide explanations of dense documents in plain English?

The first project, ChatPDF, is an AI-based information retrieval system that can help you understand PDFs better. It can handle multi-file chats, PDFs in any language, and answers and summaries. That makes it good for students, researchers and pros who want to get quick answers out of documents.

Another interesting service is ChatDOC, which supports not just PDFs but also DOC, EPUB and TXT files. It offers immediate answers, detailed AI explanations and math formula explanations with citations. It also offers a browser extension to upload PDFs and get Q&A results.

For a more focused service on research papers, Explainpaper offers AI explanations for complicated subjects. You can upload papers, flag sections you don't understand, and get explanations. The service uses GPT for explanations and offers paper summaries and multi-paper analysis in premium plans.

Last, PDF GPT offers a variety of abilities, including summarization, question answering, translation and citation for PDF documents in more than 90 languages. It's available in free and Pro versions, with unlimited file uploads and chats in the Pro version, so it's a good option for a variety of needs.