Website link: https://quill-chat-app.netlify.app Quill lets you chat with your PDF. You can upload a PDF and start asking questions to the AI. Quill uses OPENAI API to get responses from the GPT-3.5 model based on users’ question and the relevant data from the PDF as a prompt. Also implemented pricing tiers with freemium and pro plan. It limits freemium users to upload only smaller PDF files.