Robo is everywhere — and now it's going to be in 529 college savings plans, too.

A partnership among automated investing service Wealthfront, the State of Nevada, and Ascensus College Savings is launching the Wealthfront 529 College Savings Plan. The plan is low cost, according to Wealthfront, which says it "represents the lowest cost 529 plan offered by any advisor" (citing a May 2015 Morningstar report on the 529 plan landscape), adding that it "even costs less than the majority of plans for investors who manage their 529 portfolios on their own."

The new plan, then, is following the trend in 529s, which is for fees to fall even as assets rise — and for direct-sold plans to be on the increase as participants gravitate away from the more expensive advisor-sold plans.