These are our favorite iPhone apps to be productive on the iPhone, have fun, lose weight, relax, and entertain ourselves. You can use these on the iPhone XS, iPhone XS Max, iPhone XR or iPhone 8, iPhone 8 Plus as well as older iPhones like the iPhone SE and iPhone 7. Our favorite iPhone apps are a mix of free and paid apps, and anything on this list is an app that we would buy a second time if we had to.