Registern.
How formal or informal a piece of writing is. Skilled writers modulate register within a single piece — a careful technical sentence next to a plain one — while unedited model output tends to lock into one register and hold it. Variation in register is one of the strongest human signals on the page.
Rewrite AI-touched text so it reads human — meaning, citations and structure preserved, with an honest before/after score.
Open the humanizer →