Writing Kit, one of the contenders in our App Showdown of writing apps, has just been updated with a host of improvements.

Writing Kit is one of those apps that have subtitles describing what you can do with them. In the case of Writing Kit, it’s Research & Write Markdown/Fountain Documents.

Of course, those aren’t the only tasks it’s capable of. I’m more of an iA Writer person, but I can’t deny that Writing Kit is a really robust writing app, with features such as Power Search and Preview.

The bulk of the latest update to Writing Kit is focused on its sharing and exporting options. Icons are now shown beside the names of supported services to facilitate selection. Placeholder hints are now also shown within text fields, e.g. “optional, comma separated” for Tumblr tags.

Writing Kit now supports custom URL for interacting with other apps.

Speaking of Tumblr, the new version of the app allows you to pick the post state for your Tumblr posts: published, draft, or queue. It also allows you to select which among your registered Tumblr blogs you want to post to. Similarly, the app lets you choose a particular Evernote notebook when exporting through the popular notetaking and archiving service.

The update also introduces support for custom URL and MathJax. The former lets other apps interact with Writing App, while the latter makes the proper rendition of mathematical equations in document previews possible.

Compatible with both iPhone and iPad, Writing Kit is available in the App Store for $4.99.

Is Writing Kit your preferred writing app?