OptionStrat

[Mario Kex]

I recently looked for a program or website that could illustrate profit/loss on options and option strategies.
I've been utilizing Think or Swim with a paper money account in the past.

I was surprised to find https://optionstrat.com/ and fell in love with it immediately!
The basic functionality is free, and in addition to a strategy editor and optimizer, they also have great texts outlining specific strategies, starting with an explanation of PUTs and CALLs that is quite easy to understand. Additionally, they have tutorial videos explaining every feature. It can be useful for people new to options.

Their paid products are just adding non-delayed data, computing return on risk and profit chance of a strategy. They also offer an expensive "unusual flows" which attempts to identify interesting opportunities but I don't think that is that useful (I don't know but I think won't use that personally).