Screenshot pro 2 - rated 4.2/5 with over 10,000 downloads and no IAP.
With Screenshot Pro you can take screenshots and screen videos with just 1 click, share it with any app or crop it. Screenshot Pro is hided to the notification bar, once it is launched. That means it is always and everywhere accessible, no matter on which screens you are. You can also add a floating button to have it accessible even more quickly. By clicking on the button or the notification you can take screenshots or screen videos instantly. All screenshots and videos are stored in the gallery.
Night mode pro - rated 4.1/5 with over 10,000 downloads and no IAP.
Night Mode app filters blue light that according to the latest research studies boosts alertness and may affect your natural sleep and wake cycles (circadian rythm). Additionally it precisely controls screen color temperature to setup the best light to calm down and relax.
Re. Night Mode Pro - this is usually done by placing a contrasting semi-transparent overlay over the whole screen, some apps won't work if an overlay is enabled, (eg. TransferWise and some sections of Settings).
Helps if the filtering app has a way to whitelist certain apps so that the overlay is disabled when they run, which Night Mode Pro doesn't seem to.