Jisho

90% of the time it's 簡単.
It's japanese so maybe you can add a bit of uncertainty in there or use negative form to sound more humble and polite.
E.g. 簡単かもしれない。多分簡単だと思う。そんなに難しくないと思う

thank you very much

Yes, you can use both phrases to convey the same meaning of "I think it is easy."