Readbox is a platform powered by advanced AI models that enables users to transform written content into podcasts, delivering high-quality audio experiences. Users can add content by submitting a URL or forwarding an email to add@readbox.app. During the early access period, the product is free to use, offering ad-supported features, premium voices, custom RSS subscriptions, and unlimited submissions. A paid Pro version is also available for $10 per month, providing an ad-free experience, premium voices, custom RSS subscriptions, and unlimited submissions. Readbox aims to bring high-quality content to users' podcast players, support creators, and adhere to open standards. Users can submit content via email and enjoy it on their preferred podcast applications.