Which platform is free for trading?

Several trading platforms offered commission-free trading for various asset classes, including stocks and exchange-traded funds (ETFs). Please keep in mind that the landscape of commission-free trading platforms may have changed since then, and it's essential to check the latest information and terms of service for any platform you're interested in. Here are some platforms known for offering commission-free trading at that time:

1. Robinhood: Robinhood is widely known for pioneering commission-free trading in stocks, options, and cryptocurrencies. It has a user-friendly mobile app and a web-based platform.

2. Webull: Webull offers commission-free trading of stocks, ETFs, options, and cryptocurrencies. It provides a desktop platform and a mobile app with advanced charting tools.

3. M1 Finance: M1 Finance is a robo-advisor and brokerage platform that offers commission-free trading of stocks and ETFs. It focuses on long-term investing and allows users to create customized portfolios.

4. SoFi Invest: SoFi Invest provides commission-free trading of stocks, ETFs, and cryptocurrencies. It also offers financial planning and educational resources.

5. Public: Public is a social investing platform that offers commission-free trading of stocks and ETFs. It emphasizes community-driven investing and allows users to invest with as little as $5.

6. Dough: Dough is a commission-free options trading platform. It focuses on options trading and provides a user-friendly mobile app.

7. TradeZero: TradeZero specializes in commission-free stock and options trading. It offers a downloadable trading platform with advanced features.

8. Ally Invest: While Ally Invest offers commission-free trading for stocks and ETFs, it also provides a range of other financial services, including banking and retirement accounts.

Please note that while these platforms may offer commission-free trading for specific asset classes, there may still be other fees associated with trading, such as regulatory fees or fees for trading in foreign stocks. Additionally, some platforms may offer premium services or paid features that come with fees.

Before choosing a commission-free trading platform, it's essential to review the platform's terms and conditions, as well as any potential limitations or restrictions. Trading involves risks, and your choice of platform should align with your financial goals, trading preferences, and the types of assets you wish to trade.