Can I use Coinone in the US?

Excuse me, I'm curious about something. I've heard about Coinone, and I was wondering if it's possible to use it in the United States? I'm trying to diversify my investment portfolio and I'm considering cryptocurrency as an option, but I'm not sure if Coinone is available for US-based investors. Could you clarify if it's accessible in the US, or if there are any alternative platforms that you would recommend for someone like me? Thank you in advance for your help.