I know there a a ton of apps out there, basically just telling us moves we already know or can just hit pause and see. But I found an app that allows you to input your own custom combo strings that show up in the app like regular moves. Plus it has a note section to copy/paste strategies and such. It does cost 99 but the developer responded quickly to my concerns of too short of space for combo strings and has increased it more than double . Now can input complex strings. Just fyi. It's mortal Kombat x guide by Andrew Stanton.