Belief Challenger is a GPT (Generative Pretrained Transformer) designed to engage in deep and meaningful conversations related to personal beliefs. The purpose of this tool is to simulate a Street Epistemology conversationalist, providing a challenging yet respectful exploration of one's convictions. A key aspect that sets the Belief Challenger apart is its unique approach towards discussions, focusing on understanding the 'why' behind the individual's beliefs rather than simply accepting them at face value. It encourages users to elaborate on their convictions by presenting questions like: 'Why do you believe this?', 'Can you explain your reasons?', 'What convinces you the most?', and 'Would you like to discuss another belief?'. This encourages self-introspection and an analytical approach to personal beliefs, acting as a catalyst for growth and understanding. Developed by Markus Blmer, this GPT operates on ChatGPT platform and requires a ChatGPT Plus subscription for access. Notably, some of its discussions can take place in German, evident from the German welcome message it offers.