Zack KI puts an AI one keystroke away. Select text or files in any Windows app, press Alt+1, and ask. The selection is attached as context. PDF, Word and Excel from Explorer come along without opening them, and the answer can be written straight back into what you marked. Built for quick everyday questions, not a replacement for your main AI chat. Chats stay on your PC, servers in Germany, no request storage. Windows only. Free to try: 500 starter credits, then 100 per week, no card needed.