I actually went to google play and searched texas method. It came up with something called strong log, which seems to be perfect for logging 5x5 and what im going to be doing. Winning!
The way I log workouts is on a notebook or loose leaf paper. Throw it in my gym bag and I just make notations in between sets or after each lift. I can remember all my working weights and reps and sets when I log it online but it still helps to have it written down in front of you in a notebook.