I am using portfolio123.com for a very long time and satisfies their backtesting based on fundamental data.
For Quantopian, it misses with the fundamental data, but adds minute data, also interactive brokers integration.
I am wondering anyone is developing strategy based on minute data for trading frequency within minutes? I believe this is where Quantopian platform should be focused.
The message board needs to be improved, adding sorting on views, replies, annual returns and Sharpe ratio, so I can quickly explore existing community contributions.