Resurrecting an older thread, but I've used ProCamera, Focos, and Halide. Focos is nearly unusable. I paid $5.99 for Halide and ProCamera each and was again quite disappointed with Halide, especially after the recommendations so tried ProCamera, and overall, while not great, ProCamera is the best of the three apps, but isn't close to Apple's Portrait Mode. I hope Apple releases an update to allow for non-human subject Portrait Mode and this can obviously be done with a single lens as the Pixel 2/3 have shown. If the XR isn't updated with a software patch, I'll likely upgrade to whatever replaces the XS. Ironically, I have found the Portrait Mode on the XR much more usable than my 7 Plus when taking pics of people. Here's a couple shots I've taken. This is using the native Portrait Mode and native Photos filters. The color photo is actually no filter applied, just a stock photo.