as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
what is a good service that will allow me to practice options trading with a pretend-money account?
user
try thinkorswim by tdameritrade. it allows you to paper trade with a powerful trading platform. there's also a mobile app so you can trade on the go. good luck!
assistant