PdfGPT is an AI-powered PDF chat and summarization platform with 166,218 registered users (99% verified emails), 51 paying subscribers, and ~$542 MRR (~$6.5K ARR). The product generates organic traffic through Google, ChatGPT, Copilot, and Perplexity, with AI referrals delivering the highest engagement. It has proven demand across multiple languages and regions, plus a strong student user base (2,548 identified students). Operated solo with minimal overhead, the biggest upside lies in SEO.