New AI voice and video tools can look and sound like you. But can they fool your family—or bank? WSJ’s Joanna Stern replaced herself with her AI twin for the day to find out.

AI voice refers to the synthetic or computer-generated voice created by artificial intelligence technology. It involves using algorithms and machine learning models to generate human-like speech patterns and intonations. AI voice technology has advanced significantly in recent years, allowing for the creation of highly realistic and natural-sounding voices. These voices can be utilized in various applications, such as voice assistants, virtual agents, voiceovers for videos, audiobooks, and more. AI voice technology has the potential to enhance accessibility, provide interactive and personalized user experiences, and automate voice-based tasks.