Postie is a simple and elegant app for Scriptogram. You can easily write your posts in Markdown and then post directly to Scriptogram with Command + P.
Themes: Postie currently has 2 different themes for the app, Dark and Light. They are both beautifully simple, but the Dark theme can be useful when you are writing at night time.
Notifications: Postie supports the Notification Center, to give you information on your post status. For example it will show if it successful, or if it didn't work, it will show the reason why.
Fullscreen: Postie also supports Fullscreen, to maximise the typing area and also to get rid of all the unwanted distractions. You can toggle Fullscreen, by the arrows in the top-right corner, by pressing Command + F, or by going to File -> Fullscreen.
File Saving: Postie also features some basic file-saving options, if you aren't ready to post just yet. If you just type a filename in the text box at the top of the screen, you can then open or save a file of that name. That filename is also the name used when you post to Scriptogram.