Curvo is a Robo-advisor only available in Belgium. It is accessible through a mobile app (no desktop version), and it offers passive investing strategies through index Funds. Your money is managed by NNEK, a Dutch investment firm. Curvo charges a 1% yearly management fee.Curvo is a Robo-advisor only available in Belgium. It is accessible through a mobile app (no desktop version), and it offers passive investing strategies through index Funds. Your money is managed by NNEK, a Dutch investment firm. Curvo charges a 1% yearly management fee.