Mac/iOS: ia Writer is one of the more popular minimal text editors, and the Pro edition for both Mac and iOS adds some useful extra features. While it retains the simplicity of just offering text on a page, Writer Pro also includes several modes for different stages of writing and an incredibly useful syntax control to give you a lot more power when you're editing.
Writer Pro has three different modes: note, write and edit. Each of those modes has a different font and cursor style so you can differentiate between the stages. Each stage is also saved as a different file so you can switch between the versions. You'll always be writing in Markdown, but you can easily export the results as a DOC, HTML or PDF file.
The feature that really makes Writer Pro stand out is its new syntax control. This automatically highlights different grammatical elements such as adverbs, adjectives and prepositions. So, when you're editing, you can just turn on a switch to display all your adverbs and then happily go through and delete most of them. This also helps catch any redundancies you have. If you're editing a large piece of text, it's an amazing tool to have around.
Writer Pro is expensive: $20.99 a piece for the iOS and Mac versions, but the syntax control alone makes it worth it if you're editing a longer work. The iOS and Mac versions are identical. Writer Pro's certainly not for everybody, but it's worth a look if you want a little more out of your minimal text editor without stepping all the way up to Word.
Writer Pro ($20.99) [Mac App Store]
Writer Pro ($20.99) [iTunes App Store]