Pi, a free conversational AI app available on iOS and Android with no in-app purchases, is built by Inflection AI. It is designed around emotional intelligence, responding like a patient, non-judgmental friend rather than firing back facts. The app offers prompts such as "just vent," "brainstorm ideas," or "let Pi guess your horoscope," and is intended for untangling thoughts before a decision, not for emergencies. Users can start typing or talking within a minute of installing, and the voice mode feels like a phone call with a calm friend. Pi asks for microphone access for voice chats and stores conversation history to personalize future replies, with a training data transparency notice published by Inflection.