MarkdownNote makes it really easy to create notes using John Gruber’s popular Markdown markup language in your iPad. Using live preview feature, you can preview your Markdown markup syntax to HTML on writing.
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MWeb Alternatives
MWeb is described as 'Can handle professional-level markdown with support for markdown extensions. It provides publishing to various social networks and blogging formats, as well as various preview themes' and is an app in the office & productivity category. There are more than 50 alternatives to MWeb for a variety of platforms, including Mac, Windows, Linux, Web-based and iPad apps. The best MWeb alternative is Typora. It's not free, so if you're looking for a free alternative, you could try ghostwriter or Clearly Markdown. Other great apps like MWeb are Ferrite, Rentry.co, marka.md and Ulysses.