For manual camera control, apps like Moment
or FiLMiC Pro are brilliant. For slow shutter speeds, I love Slow Shutter Cam (IOS) or Camera FV-5 (Android) and am currently enjoying getting
to know ProShot (IOS and Android). Focos is a great app for depth of field and a lot of fun to play with, too.
When it comes to editing, Snapseed and Affinity Photo for iPad are definitely my go-to programs. I love how Snapseed is ‘non-destructible’ and works in layers so that you can always go back and undo any stage of your edits. Affinity Photo is such a powerful app on the iPad that it feels like I’m working on a desktop. You get all the benefits of desktop editing combined with the ability to edit on the fly!
There are also additional editing apps like SKRWT and TouchRetouch that I use for more specific edits like lens distortions, converging verticals and removing unwanted bits in photos.