For testing strategies I mostly use https://optioncreator.com/ . It's a simple and basic options tool. Unfortunately it lacks a feature IMO: all positions are opened at the same time, ie. the begin date is the same for all positions. But I would also like to test scenarios where one opens some positions some weeks/months later (hoping for then a risen (or fallen) IV and/or spot etc.). Ie. the current version lacks entering positions with different starting dates (real dates or offset dates). Is there a similar tool available out there? A command line tool is fine too if it can create also either a chart file or just CSV data for that, etc... Btw, this is not an options backtester, but just a strategy builder and tester without using any official market quote data.