No sign up. Your script stays in your browser and is never uploaded.
Lines written fully in capitals show as small section headers. Text in (brackets) shows as a dimmed stage direction. Your edits save automatically in this browser.
While prompting: Space plays or pauses. Up and down change speed. Left and right jump a paragraph. Plus and minus change text size. R restarts, M mirrors, F goes full screen, Esc comes back here. Click the text to play or pause, scroll to move manually.