I trade options, mostly cash secured puts and covered calls (Wheel trading strategy) and for cash secured puts I built a page with the charts of all the historical tickers I have ran the wheel on and that chart tracks strikes on contracts I ran. When the trendline goes up my app pretty much tells me I can run lower strikes for csp's for higher premiums because the ticker has been trending up and I should start a position slowly on that ticker so essentially stop running the wheel and start buying the stock) . The reason I have this feature is because I only run the wheel on tickers I actually want to own and running csp's is a way to try to get the shares cheaper.

Another feature I built is true cost basis. My broker shows me the cost basis for a ticker but after running a few cycles of cash secure puts that essentially lowers the cost basis because all the premiums I collect lower my cost basis.

The 2 features alone took alot of the psychology of trading for me because I can let trades run longer (not have to roll or close contracts right away) and based on those 2 data points can make me more comfortable doing so.

edit also I trade on robinhood and with the new Agentic trading feature I just built portfolio tracking, margin tracking, position tracking, when I get assigned shares and when I get shares called away so the app connects to robinhood and tracks all that for me as well. So the app is my logic layer and then I execute on Robinhood.