All of these are mobile apps for phones or tablets. Not all are available for both Andoid and Apple at this time.
From iMedicalapps Review of Readers-see link below
"Here, we name the overall best app for keeping up with the medical literature. But recognizing that there are a number of quality choices out there that may fit some clinicians better than others, we’ve also put together a guide to picking the app that is best for you based on what you want to do. We look at journal highlighting, CME activities, keeping up to date with news briefs, and more."