Show Luma a photo whose look you love and it works out the adjustments that take your photo there, handing them back as real sliders rather than a filter. 2.0 adds a full editor around that: tone curves, an eight-band colour mixer, split toning, black & white, masks, crop and lens fixes, retouch and burst culling. It edits inside the Photos app, never touches your original, and runs entirely on device. $14.99 once, no subscription.