no there is no app i'm afraid. I don't have the knowledge to make phone apps and it would cost many thousands to hire a company to do it. All you would have in the end is a prettier mobile website version really.
For now please just use the web browser on your phone.
yea it would be a huge undertaking. Just the API alone on the server end would take months... that's before you even start looking at the front end/client app on the mobiles. Then you have to do all kinds of security penetration testing to make sure the APIs aren't leaky.
And considering I'm really struggling with the recovery from my operation at the moment this is definitely something not on my to-do list im afraid. Sorry