I Tested 5 AI Tools to Write a PRD—Here's the Winner

A hands-on comparison of five AI tools (ChatGPT, Claude, Gemini, Grok, ChatPRD) for writing Product Requirement Documents, with Claude ranked first for strategic depth and HTML mockup quality. The author emphasizes that pre-AI strategic thinking ('back of the napkin' outlines) dramatically improves output quality across all tools. Includes practical PM workflows for sprint planning, stakeholder alignment, quarterly planning, and customer research, plus common pitfalls and prompt engineering principles.