Hmm—check out this little widget in the latest version of Post, Adobe’s mobile typesetting app:
I haven’t yet used it enough to know how well it works for me. I’m all for enabling rapid exploration & happy accidents, though I’m wary of the paradox of choice.
If this kind of thing is up your alley, you might also enjoy the animated type app Legend (recently bought by GoPro—part of the Stupeflix/Replay deal) and Wordswag. They too emphasize presets + variations.