I know fidelity offers lots of mutual and index funds and etfs but I can't figure out how to research and compare them on their app. I can't even find mutual funds in it and I know they have them.
I can't speak to their app because I don't use it, but logging in to the website allows you to look at all of their funds. Click on Investment Products, then choose from the drop down menu Mutual Funds or ETFs.
