MackinVia, a tool available in Loudoun County Public Schools, provides books with a built-in text to speech function which also features dual highlighting. This means the sentence being read aloud is highlighted yellow while the words being spoken are highlighted in grey. The dual highlighting invites learners to follow along with their eyes. MackinVia is available through LCPS Go and as an app in the Google Play Store on Chromebooks.

Screenshot of dual highlighting in Mackinvia