Vanguard Digital Advisor combines Vanguard's ultra-low-cost index funds with automated portfolio management. At 0.15% all-in, it's one of the cheapest robo-advisors available. The platform builds your portfolio from broad-market index funds and ETFs, automatically rebalancing as markets shift. If you want to see how it stacks up against premium competitors, read our Wealthfront vs Betterment comparison. Not sure whether automation is worth the fee? Our DIY vs robo-advisor guide breaks down the trade-offs.