What are some of great sites/apps/software for back testing Options Strategies. either paid or free? Thanks!
If you are looking for a free service, then Tasty's Lookback is a good choice. From the paid services I found MesoSim from Deltaray superior to others, including ORATS.
TOS (Thinkorswim). It is one of the best and complete platforms with advanced options backtesting features.
Correct me if I'm wrong, but I believe you can't do dynamic adjustments in ORATS to keep your structures as initially planned. I think this approach is a must when it comes to options trading.
Not totally following you..Are you referring to Delta hedging,maintaining your initial vega/gamma??? I use Orats more of a research tool,idea generator and backtester.