I really recommend Quiver (http://happenapps.com http://happenapps.com). It supports code blocks, LaTeX, html, markdown, etc., as well as attachments of any kin

I really recommend Quiver (http://happenapps.com http://happenapps.com). It supports code blocks, LaTeX, html, markdown, etc., as well as attachments of any kind (pdf, jpg, etc.) The format is well documented and open (https://github.com/HappenApps/Quiver/wiki/Quiver-Data-Format https://github.com/HappenApps/Quiver/wiki/Quiver-Data-Format), so you could potentially write your own parser if it ever becomes unsupported! There's also an android app (called quaver) that someone else (not the original developer), has built using the open JSON specs. It works, but isn't that great. Syncing the JSON data to the cloud keeps all devices in sync. It also has an import feature that allows you to import your Evernote notes.