Thinkorswim by TDAmeritrade. No one else has figured out how to lay out options ...

JamesSwift · on May 2, 2022

Uhhh well I would argue Tastyworks does it even better. But that was built by the same team so maybe its cheating?

aaaaaaaaata · on May 4, 2022

Who was first?

JamesSwift · on May 5, 2022

Well they made Thinkorswim, which was acquired by TD Ameritrade. After the lockup period, they left and created Tastyworks.

julianeon · on May 2, 2022

thinkorswim, created by thinkorswim and acquired by TDAmeritrade.

In case someone is wondering how a staid brokerage came up with this incredible technology: the trick is, they didn't.