I recently came across Mela on the App Store.
It is a delightful app. Nothing clever or fussy — just the underlying architecture of an RSS reader / HTML prettifier niched down to the world of recipe management.
It is a very clever app for that exact reason. The developer is also behind Reeder, a well-known RSS application and it is fairly obvious from comparing the two that they share a lot of DNA, both in terms of UI and underlying architecture.
I am envious of this! This is a smart way of extending yourself far as an independent developer: build something, find what else can be built (and marketed) using what you've already built. (I'm not suggesting that Mela is literally part of the Reeder codebase, but that doesn't matter — the tacit knowledge you get transfers just as easily as library code, and in some cases even more easily.)