What's the best stock to buy on cash app. Summary of the Best Stock Trading Apps of 2023. Fidelity Investments: Best for Wide-Range of Investment Products. Merrill Edge: Best for Research. SoFi Invest: Best for Beginners. Interactive Brokers: Best for Advanced Traders. TD Ameritrade: Best for Customer Support.Nov 3, 2023 · First up, there’s the TD Ameritrade Mobile App. This is targeted toward relatively simple investments. With it, you can create price alerts, view stock watch lists, and examine charts wit