I just sent an email about it but I'll post it here too - The apps on the sticky are still Exodus and Infinity, both of which are no longer in active development.
Exodus has lost greentext and doesn't support captcha, hasn't been updated in months now.
Infinity hasn't been touched in over a year and is still horribly broken.
Newer apps are available.
Ouroboros
Developed by a user on /tech/ and available on F-Droid, Github, and GPlay
https://github.com/Luorrak/Ouroboros/
https://f-droid.org/repository/browse/?fdid=com.luorrak.ouroboros
https://play.google.com/store/apps/details?id=com.luorrak.ouroboros
And Overchan, while more suited for multiple imageboards is available, also on Github/Fdroid/GPlay
https://github.com/miku-nyan/Overchan-Android
https://f-droid.org/repository/browse/?fdid=nya.miku.wishmaster
https://play.google.com/store/apps/details?id=nya.miku.wishmaster.sfw