I've done it for a while. I use https://www.folioinvesting.com/.
Short story: Great option for investing regularly, and staying diversified without paying a ton of fees.
Long story: The fees are something like $250 fixed for a year, but includes 250 trades a month, which allows you to buy and balance lots of stocks regularly. I usually own stocks in between 50 and 100 companies.
For example say you think Biotech will do well - not just 1 company but the whole sector - you can just tell them buy $XXXXXX in https://www.folioinvesting.com/rtg/folio.jsp?name=Biotechnology , and it will automatically spread your investment in 30 of the biggest Biotech stocks.
To do that with a regular broker, even with low fees like $5/trade you would pay $150 and it would be a lot of work, but here just a couple of clicks and it's done with no extra fees.
If you want to invest money regularly like out of each paycheck you again save a lot of trade fees each time.
And, it's not like mutual funds because you can buy any stock you want and manage yourself.













