Apex Clearing's website is here: https://apexfintechsolutions.com/ They have 19M brokerage accounts and a lot of brands you've heard of got their start with Apex (Robinhood, Wealthfront)
I've never heard of Wealthfront, and I know Robinhood mostly for exploiting low-info customers & trying to make investing even more like gambling than it already is[1]. Pretty gross company to be keeping IMO.
