Thinkorswim by TD Ameritrade (often stylized and officially branded as thinkorswim, lacking capitalization) is an electronic trading platform by TD Ameritrade used to trade financial assets. It is geared for self-directed stock, options and futures traders. It was previously offered by ThinkorSwim Group, Inc., which was purchased by TD Ameritrade in 2009. TD Ameritrade provides services for self-directed option traders and institutional users who invest in equities, exchange-traded funds, futures, mutual funds and bonds. Thinkorswim provides financial literacy services for self-directed investors including trading tools and analytics. It offers a range of investor education products in a variety of interactive delivery formats, including instructor-led synchronous and asynchronous online courses, in-person workshops, one-on-one and one-to-many online coaching programs and telephone, live-chat and email support. Thinkorswim is used in conjunction with trades of equity securities, fixed income, index products, options, futures, other derivatives and foreign exchange. The Thinkorswim software is provided free for account holders of TD Ameritrade and trades via the TD Ameritrade platform are free. thinkScript thinkScript is included in thinkorswim. thinkScript allows you to use a simple coding language to develop your own tools for creating custom graphical data. As changes are made to a row of the program code, the live set of curves is instantly updated. thinkScript function is similar to functions in programming languages. After you type the letters of a thinkScript function word, a small yellow "pop-down" selection box appears. Sometimes it helps to select (confirm) the function in "drop-down" selection box. Otherwise, sometimes, the typing can appear as plain text, instead of the white or green code text that indicates a thinkScript function. There is extensive live, row by row, code error format checking. When errors are present, the study name label header changes to red. A listing of errors by rows (and columns beside the row #) appears at the bottom of the screen., See Also: Representational state transfer, eSignal History Thinkorswim, Inc., was formed through multiple company mergers and acquisitions: In 1982, Telescan, a provider of stock charting and screening tools, was founded by Richard Carlin in Houston, Texas. In 1997, Online Investors Advantage, an investor education company, was founded. In 1999, Thinkorswim, Inc., was founded as an online brokerage specializing in options by Tom Sosnoff and Scott Sheridan In 2000, an international investor education company, ZiaSun, acquired Online Investors Advantage. In 2000, Lee Barba started as CEO with Telescan. On December