hm.. I want to Journal on a electronic device..

dear readers..I hope you read this in good health. now onto what I want.I am looking into journaling my life.. but I hate writing on books as they're hard to organise... and I currently use onenote but my pc is too big to carry everywhere. is there some software preferably on 3ds or ps vita (I am looking to purchase one unless someone recommends I wait or choose neither). or rom for that kind of stuff? any other kind of software for pc or android will be appreciated too..edit: I prefer writing with a stylus.. too

I somehow doubt there's anything like that for ds or vita, but there's most certainly such software for android devices. You can even get a fully featured word processor on android.