Most people posting stories are not designers and do not want to become designers. They want the thing they already have in their camera roll to look deliberate. StoryPop is a template editor for exactly that.
There are over 300 templates, 600 stickers and 100 backgrounds, sorted into aesthetic collections — grunge, retro, vintage, celestial, mood board, film — because that is how people actually search for a look. You drop in photos or video, build collages, and adjust from there. 47 fonts for text, and 30+ filters that work on their own without a template if all you wanted was the colour grade.
It shipped in 2019 and has been updated steadily since, currently on version 4.17. Running one app for six years teaches you things about maintenance, taste drift and subscription pricing that shipping a new one never does.