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 Fidelity Go if you want an automated portfolio from one of the biggest brands in finance with solid customer support and reasonable fees.
Betterment
Automated
Fidelity
Automated