Acorns the digital savings and investment app has just raised $23m in Series C funding. The round was co-led by Greycroft Partners and

The 8 month old spp has grown to more than 650,000 members, opened over 300,000 investment accounts, processed over 28m trades and facilitated savings of over $25m.

The company does not charge commisions but takes a $1 month flat fee on accounts under $5,000 and a .25% fee on accounts over that amount.

Acorns customers now contributing an average of approximately $100 a month into savings accounts.