I don't know any other standalone /app stores/ - Play & Amazon are the main ones I think. You could submit to directories that link to those, e.g:- Appseeq let

I don't know any other standalone /app stores/ - Play & Amazon are the main ones I think. You could submit to directories that link to those, e.g:- Appseeq lets you add a page for your app that links to your main app store listing on whatever (google play etc..) - so it's more of an app directory, but worth submitting to a few of those too.