You probably saw this coming.
Slugline is an app for writing screenplays. It uses Fountain as its native file format. It brings the power and simplicity of plain text to screenwriting, without sacrificing features that screenwriters need. In fact, Slugline is focused entirely on the writing part of screenwriting. It has annotation, integrated outlining, and Fountain’s ability to omit text without deleting it, all driven by the text you type.
Your files are plain text, editable with any writing software, on any device. But when you print them from Slugline, they appear as a perfect, industry-standard screenplay. Better, in fact, because Slugline optionally lets you use Courier Prime.