Ive been using Olive Tree Bible for several years and have been more than satisfied. I underline passages with color coded lines or highlights all of which I can change and name. I have also been writing notes about various passages, so I now have my own commentary at my fingertips. My church uses the NRSV, so this version is quite handy. I also have the KJV, NIV, and Strongs ESV in which all I have to do is touch a word to see the original word in Greek or Hebrew. I highly recommend this app-- it is easy to use and helpful in Bible study.
Chuckov I about NRSV Bible by Olive Tree, v6.0.7