Lots of apps use the user interface elements like seekbar and slider these days. The function of them is pretty simple, but it could be implemented differently from the design perspective. User experience of the function can largely depend on the narrative and the idea of the app. Fortunately, there is a group of app developers who were generous enough to develop some open source UI libraries with these elements and they shared them on Github.
We dig into the archives and find some UI libraries with seekbar and slider. Here they are: