Hi Pablo, Essentially they are the same, the "alright" is just a contraction of "all right" and you cannot really hear a difference between them in speech but when writing most people would use "alright."

Hi Pablo Gabriel 'Alright' is in my dictionary and I think I've seen it used but it's described as 'non-standard'. I would avoid it and always use 'All right' instead. I found this which might help: http://www.oxforddictionaries.com/words/all-right-or-alright It looks like there's other interesting stuff on this website which you might find useful. Roger.

Okay, thank you.

Now I think is better 'all right' for writing :)

Thank you Pablo for asking this question, I have also a problem with that word specially in writing. So, I just want to know if we should write "alright" or "all right".