PrankGPT is a tool designed for prank calls. It allows users to enter a phone number and choose a voice to prank the recipient. The tool uses AI technology to generate a conversation based on a prompt given by the user. It offers different voices, such as Marv (an evil prankbot) and Zephyr (a gen Z queen), to add variety to the pranks. PrankGPT is built with Vocode, an open-source library for voice-based LLM apps. It provides a fun and interactive way for users to play pranks on their friends or acquaintances.