Tapping words, particles, and phrases brings up dictionary entries and explanatory notes, and the ability to add items to a study list to review new content from.
Satori Reader, which we've covered quite a bit in the past, released their new mobile apps!
If you aren't familiar with Satori Reader, it's a site specifically designed to provide +1 Japanese reading and listening content. It's meant to be challenging, but not too challenging, and not too easy either. All of their content is created in-house, and they regularly update the site.
Stories, articles, dialogues, and lessons can be customized to your level of kanji. Tapping words, particles, and phrases brings up dictionary entries and explanatory notes, and the ability to add items to a study list to review new content from. And, if you aren't sure if you understood a sentence, each one has a hidden English translation.
Now all of this, the audio, text, study list, etc., is all available on the app, along with the ability to either keep the site's content on the cloud or on your phone. Have a long flight to Japan coming up? You can still use Satori Reader without Wi-Fi!
While you do need a subscription to Satori Reader to access all of the site's content, the app itself and most of the first pages of their content is still free, so it's worth a try.