I use the app steemify. It is strange that it wouldnt show up in a app store query but i went through my list of apps to retrieve a link.

Steemify by B Rexwinkel
https://itunes.apple.com/us/app/steemify/id1290154477?mt=8

You may also want to look into esteem
eSteem Mobile by Feruz Muradov
https://itunes.apple.com/us/app/esteem-mobile/id1141397898?mt=8

Another option is to use the website
Https://busy.org

Hope this helps!