Brainscape's desktop website and mobile app contain all of the same core features: Finding, Creating, Sharing, and Studying flashcards. Most differences in functionality are minor and are continuing to disappear as our technology evolves.
Whenever you do something on the website (e.g. edit a flashcard or study a deck), those changes should be immediately synced to your Brainscape iOS or Android app. And whenever you do something in your mobile app, those changes should be similarly synced with the website. We aim to create a "device-agnostic" learning experience.
That said, there may occasionally be times when your data temporarily appears out of sync -- e.g. if you have been using your Brainscape mobile app while "offline" and haven't yet been able to hook up with our website.
If that is ever the case, you can simply tap the Sync button in the top-right of the Library screen in your mobile app, and all should be right with the world.