The auto submit slider doesn't work for me (on Android) but I can imagine what it would be like. I don't think the Portuguese speech to text is good enough for the app to be usable hands free even if the slider did work. For example, it just transcribed
"Eu quero ir a assistir ao filme." (which is almost correct)
"Eu quero ir a assistir ao filme." (which is almost correct)
as
"Eu quero ia AA chistian ao filme."
These errors have to be corrected by typing.