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 Schwab Intelligent Portfolios if you want an automated IRA with no management fee and a wide range of portfolio options.
Betterment
Automated
Charles Schwab
Automated