Readio

Readio is an AI text-to-speech reader designed around a simple observation: a lot of reading does not require your eyes. Reports, course readings, ebooks, and long articles can be absorbed while commuting, exercising, or doing chores, if the audio is clear enough and you can still track where you are. Readio's core feature set is built to make that practical rather than fiddly.

The reader works in two modes. A text reader handles webpages and pasted text, while a file reader accepts PDF, EPUB, DOCX, RTF, ODT, HTML, TXT, and Markdown uploads, so you generally do not need to convert anything first. During playback, sentences highlight in sync with the audio and the page scrolls automatically, which is the difference between listening and actually following along. Playback controls let you change speed, jump between sections, and move to specific parts of a long document.

On the voice side, Readio uses OpenAI's text-to-speech engine and exposes six voices with distinct characters, from the balanced Alloy to the narrative Fable and the bright Nova. It advertises reading support across more than 140 languages and dialects. There is also a practical filtering layer that skips footnotes, superscripts, and bracketed asides so the audio stays clean, with the option to manually exclude sections. Readio runs on a freemium model with a free tier and paid plans.