Pi

Pi is a personal AI assistant made by Inflection AI, a company in Palo Alto, California. It launched in May 2023. Pi was designed for conversation more than tasks. It asks follow-up questions, gives advice and talks through ideas or problems in a warm tone.

Users can chat by text or talk to it by voice, with several voices to choose from. It is available on the web and on iOS and Android, and in some messaging apps. It runs on Inflection's own models. Pi remembers earlier parts of a conversation so users can pick up where they left off. It can also search the web for recent information. Many users treat it as a sounding board for daily plans, worries or decisions, though it is not a replacement for professional help.

Pi is free to use. In 2024 Microsoft hired most of Inflection's staff, including co-founders Mustafa Suleyman and Karen Simonyan. Inflection then turned its focus to selling AI to businesses, and Pi stayed online for consumers.