Most playlist problems are one of four things. Something will not play, and you need to know whether the address is genuinely dead or merely refusing to answer a browser, which are different problems with different fixes and look identical from the outside. The list is a mess. You were handed credentials rather than a file. Or you want the data in a shape a spreadsheet or a script can work with.
Start with the checker if something is broken. If the list is long and half of it is dead, the cleaner is the faster route, because there is no point editing four hundred entries you are about to delete anyway. And if what you were handed is a login rather than a playlist, the Xtream converter turns one into the other first.
All eleven work the same way underneath. Your file is read in the browser, changed there, written back out when you ask for it, and at no point does any of it reach a server here, because there is no server here that takes playlists and no account for one to be stored against. That is architecture rather than a promise. It is also why none of these tools can help if the file itself is gone.
None of them provide channels. They work on the playlist you already have, wherever it came from: a subscription, a media server you run, somewhere you found yourself. That is the whole scope.