Betterment is a great option if you want an automated, low-fee portfolio from the largest independent provider of digital accounts. Betterment was a pioneer in providing "set-it-and-forget-it" portfolios for a low-fee.
Consider SoFi Automated if you want a zero-fee portfolio from a digital brand with a range of other financial products like student loan refinancing and debit cards.
Betterment
Automated
SoFi
Automated