Expressivo is an application that allows you to automatically convert text into speech with natural, human sound. It is based on Ivon's built-in speech engine, allowing you to listen to content such as books, documents, articles and e-mails on both your home computer and your portable MP3 player. The application is good at reading subtitles for films, so it is often used as a lector.

During the installation, the user has the possibility to select the voices that will be installed together with the program. Among the available voices are Polish (Jacek, Ewa, Jan, Maja), but also English (Eric, Jenifer, Brian, Amy) and Romanian (Carmen). Expressivo integrates with the most popular mail clients (MS Outlook, Outlook Express, Thunderbird), web browsers (Firefox, Internet Explorer) and other applications (Skype, Word, etc.).

Built-in plugins - watch-keeper, RSS news reader and mail monitor - extend the functionality of the program. The trial version allows you to use the program for 30 days.