Wealthify is the cheapest robo-advisor with account fees as low as 0.6%. Robo advisor costs are based on the size of your investment portfolio with them. There are generally no dealing fees for when you buy and sell funds within the platform. The current costs for some of the best robo advisors platforms in the UK are: Nutmeg – 0.45% to 0.75% Wealthify – 0.6% Moneyfarm – 0.75%