Yes, but Betterment tacks on an extra fee for managing your funds. So you have the fund/ETF fee plus their management fee. If you go through Vanguard you just have the fund fee. I don't use betterment, but from what I gather on their site, they charge a .35% fee on top of the ETF fees.
As an example, Vanguards Total Stock Market ETF (VTI) charges a .05% fee. Betterment fee is 7x that amount extra.
Betterment shows you exactly what they invest in so you could easily create your own portfolio. If you're worried about rebalancing, Vanguard offers Life Strategy mutual funds which have an expense ratio in the .15%-.17% range. Still more 50% less than that of Betterment.
Betterment does have low fees in the sense of being an robot-financial-advisor compared to a human.