Best free web based options analyzer?

Any good recommendations for a good free web based options analyzer to find out the max risk, max profit before entering the trade, especially for complex multi-leg position? Thanks!
 
I believe the OP was after web-based analysis tools.

Without that requirement, I would recommend tos desktop software for options analysis too.

MoMoney.

Quote from zxcv1fu:

Thinkorswim's software platform has it & is free for their clients.
 
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