I teach at a school that has vocabulary testing every day or every other day. Even though Skritter is far better for long-term retention, the students are obviously concerned about doing well on their morning quiz. I feel like the scratchpad feature is great for this, but I haven't found a way to easily utilize this feature on the iOS app. Does anyone know if that functionality exists or is it limited to the website?

It doesn't exist in the iOS app at the moment. I talked to the team about that before.
However there is a workaround, which I used in the exact same situation and it can be completely performed from within the iOS app:

- Go to the lists tab and remix your textbook,
- hit "edit sections" and delete all lections except the one you need to prepare.
- switch to the "advanced study" tab and choose to only study that list,
- hit study and you're good to go.

Hope this helps and please leave a comment on how it worked for you,

Zacharias Fisches