I personally had created a shortcut to steemit on my smartphone homescreen. I do not need to log in any app and thus keep safe my keys.... I am able to write a post and share whatever i want and even comment (by the way this comment had been written from my smartphone). Anyone can shortcut steemit on his/her smartphone and logging in directly through the official steemit page. Open CHROME and log in your steemit account then hit the option buttions on the top right (the 3 dots) and tap add to home screen and you are done. you can then access steemit using the official log in page of steemit and no third party apps.