I have been a big fan of Vanguard for the past year, however it doesn’t let me buy QQQ or VGT as an automatic investing. Basically the only option I have is VTSAX which I buy four times a month and have been pretty happy with it. I look at it as our long term taxable investment.
Recently I have been looking into adding Fidelity to my tools that I use for dollar cost averaging. In theory it should allow me to buy any stock, ETF or even a basket on a cadence. However, at first glance, it seems Fidelity only allows for once a month investing.
From what I see, unlike Vanguard I cannot invest 4 times a month into the market and I am limited to only once a month.

However nothing stops you from creating multiple automatic orders and almost replicate what Vanguard does without a hastle
Below I have scheduled 4 separate automatic investments on the 8th, 14th, 23rd and 29th. The money goes from my First Republic Account to our FXAIX account.

Compare this to how easy it is to schedule weekly investments on Vanguard.

I am hoping that at some point, Fidelity gets its act together and fixes their painful automatic investing plan