I’m currently doing a lot of research on several issues using PubMed and other free literature databases. I used Endnote for several decades (but left all of my copies behind when I sold the company; giving up Endnotes has greatly improved my mental health). Today I looked at CHEAP alternatives (think $10 instead of $250) and found that Bookends ($10) or its cheaper sibling PubMed on Tap do everything I need. After you play with the fully functional PubMed on Tap, you will probably want all of the extra databases covered by Bookends.
As an aside, I find reading the abstracts off an iPad is much better than sitting in one place trying to read them off an LED panel while I am tempted to jump to the Twitter, WordPress, and ESPN windows.
My review, as usual, as a mind map. Click to expand the image.
a HubaMap™ by g j huba phd