If you're looking for a DocGPT alternative, ChatDOC is worth a look. It offers immediate answers to questions, in-depth AI analysis and multi-document chat. The system uses GPT-4 for image analysis and citations, so it's a powerful tool for students, professionals and businesses. A browser extension lets you upload PDFs and view Q&A results, and the service accepts multiple file types.
Another top alternative is ChatPDF. The system is geared for understanding PDFs, particularly research papers, legal contracts and academic documents. It can handle multi-file chats, citations and responses in multiple languages, so it's a good option for anyone looking for quick answers from documents.