I would use this, but this seems like exactly the kind of product that Google gets bored with and discontinues for no reason. I'm tired of getting burned by Google like this, they do it all the time.

Google Keep user here as well. It has few things that makes it perfectly fit into what I need:

- simple to do lists

- create notes with the phone's camera (I usually do this when taking a photo of a whiteboard)

- audio recording and transcribing: I can just say my note and Google Keep will make a text out of it with an attached audio recording

- sharing: this makes my life sooo much easier. I have one note taking app I can use for business, for sharing shopping lists with my wife, house chores with my kids, etc. When Google Keep came out first it was way too simple, but I can hardly imagine my life these days without it.

I'd recommend ZimWiki http://www.zim-wiki.org/ - a desktop app. Keep can't keep up with lots of notes :-)

ZW is speedy, portable, and extendable.

I actually use ZimWiki as well, but more as a personal blog for technical stuff to refer back to, not as a day-to-day notes app.

Quiver, Paper (Dropbox), Tiddlywiki all have syntax highlighting; of them Quiver, which uses the Ace code editor, has highlighting for by far the most languages--even Elixir.