The robo-advisor, backed by Citi and Northwestern Mutual Life, has now raised $205m in total, securing its latest funding at a $700m valuation.

Betterment, the US-based online financial advisory service backed by financial services firm Citi, raised $100m yesterday in a series E round led by investment firm Kinnevik.

Venture capital firms Menlo Ventures and Bessemer Venture Partners, investment advisory firm Anthemis Group and private equity fund Francisco Partners also took part in the round, all as existing investors.

Betterment has built a robo-advisor that provides clients with a diversified portfolio of index-tracking exchange-traded funds that can be personalised to the needs of…