Assalamu aleikum!

That is most user friendly app I’ve ever seen! Thanks for your work)

And I’ve recently started to learning hadith, so I’m beginner. Can’t figure out what are these tier letters in chain of narrations page, I assume by lack of knowledge.

That would be great if you’d add kind of small tips when you hover over several stuff or maybe page dedicated to specifics explaining what that means. Single letters don’t give me any idea of what that might be. There is probably more stuff like that and not only on hadith page.