Why not add free data sources?

We did!

You can get free historical stock market data from Yahoo, you can post stock data from EODdata services (FREE!)

We also have support for stock market data from IEX, both daily update and historical. And it looks like good data to us.

We may add other free sources but there are two major problems with most free data sources: The data is often of questionable accuracy and free data sources close down without notice.

There is information in the manual that will allow you to use data from other sources such as acsii export files.
If you find a free data source and have problems using the data send us an Email so that we can help you and can perhaps make that data stream available to other users.