@BenRiceM have been using the original Obscura forever and I find the visual feedback when manual focusing very helpful (all sorts of high-contrast sharp edges appear). This is particularly helpful outside when I can’t see the screen well because of the bright sunlight.
I didn’t see this feature in Obscura 4. I looked in settings and I think these features might be what you call “Focus Peaking” but are only enabled if I purchase the Ultra subscription. 1/2