placed TD Ameritrade first in trading software and tools due to its sophisticated platform. Thinkorswim, a service of the American brokerage firm TD Ameritrade, is widely considered as one of the greatest trading systems in the world throughout Canada, Hong Kong, Japan, European Union countries in local laws and regulations, and so on. Thinkorswim platform with TD Ameritrade mainly because its charts and tools are top-notch and simple to use for both experienced and inexperienced traders for trading options.