There are some
Apps that are available.
However - I almost never see anyone taking notes in a live tournament and I certainly never do. There is zero chance I would be able to play a tournament while trying to keep up with multiple hands to remember.
I always have a rail thread and I post basic stuff about some hands in it - but never detailed stuff - that would be way too distracting for me.
It is one thing to post brief updates - I almost need that small distraction when I play. It is quite another to make note of every detail of how a hand played out.
I have no idea how anyone could do that - and I don't think many do.
I guess younger players have better memories.