It is a complicated, grey-zone issue that usually ends in circular arguments and it just never ends. However, Yoshi-P (the game's producer) has said in interviews that while the official stance on third party tools will always be 'no', Square Enix both cannot and do not want to see what is installed on your PC. Using third party tools for FFXIV is against the Square Enix User Agreement, and should be done at your own risk as it could result in an account ban.
