I'm playing Simple Solitaire Collection by Tobias Bielefeld (https://github.com/TobiasBielefeld/Simple-Solitaire) on Android and would like to speedrun it, but I see there's no submit option for non-MS apps. Could it be added?

Only official releases are allowed. I added moblie category for both any%'s https://www.speedrun.com/freecell/full_game#Any_Hintless

Hey, Kiraa I think you should maybe review a few FreeCell apps on Android and iOS. Then maybe a list of acceptable apps can be made to make it a bit more fair for future runs. Just a suggestion. (e.g. FreeCell by MobilityWare https://www.mobilityware.com/freecellsolitaire which is on iOS and Google Play. My personal choice)

The problem is that you are playing a whole diffrent game then. There would need to be another game on Src if you would want to submit runs for that game. Until a new FreeCell game (Bill Gates saviour plz give game) only option on mobile is Solitaire collection/klondike.

Well, it's still Freecell. Those games attempt to match the original rules as close as possible. At least the game I'm playing seems to even be on a disadvantage, as I'm not able to somehow "skip" through the entire game like speedruns here do.

Even if it's still not acceptable to get them approved, could there be at least a separate leaderboard for those somewhere? I'm very new here I don't know the process needed to make one.

Im not sure if src would accept so many variants of something like FreeCell. This is basically the official one. Unless this one is converted into microsoft freecell, then a freecell mobile page is requested, then I doubt theres a lot that can be done... You could always set up a spreadsheet leaderboard with you and another players who have their own runs but i guess its not the same