Don't make this a blocker. Rebranding will hit your momentum. Since you already seek a x.app domain might as well go with xapp.com . Let's be honest for a sec -

Don't make this a blocker. Rebranding will hit your momentum. Since you already seek a x.app domain might as well go with xapp.com . Let's be honest for a sec - the .app gets you more nerd points but your market would be more comfortable with a .com