Keep your place on screen, line after line. Overdys brings classic paper reading aids to your screen — the reading ruler and the guide line used in classrooms — plus a customizable full-screen color filter. THREE MODES - Ruler: a reading window that highlights the line you're reading and masks the rest of the screen — keep your place and stay focused - Line: a horizontal guide that follows your reading position - Overlay: a full-screen color filter with adjustable tint and intensity, for your visual comfort — like adjusting your screen's tint Customizable shortcuts let you switch modes or toggle the aid instantly. Reading rulers and guide lines are inspired by tools long used in classrooms to help readers keep their place. Every reader is different: pick the mode that feels right for you. Overdys is a comfort and accessibility tool. It does not diagnose or treat dyslexia or attention disorders. Your feedback is valuable and helps improve the product.