This is the best manga app Ive found

Its way better than all the other ones because it actually lets you find manga and download it so you can read offline. The only problem I have is that it doesnt have some popular manga which is confusing. Another thing is that sometimes chapters are missing, luckily its only side chapters and they dont really advance the plot. Apart from all of that, it really is a great app for reading manga and I definitely recommend it.

Mangazemperor about Manga Bird - Best manga reader