PDF to Voice is a free and easy-to-use Android app that allows users to convert any text or PDF document to speech. With this app, you can navigate between pages, set speech rate, pitch rate, zoom in and out for better display, and even turn your e-book into an audio book with visuals. It's a great tool for those looking to concentrate more on their reading, and it also plays a role as a virtual eye to visually impaired individuals.

The app's simple and intuitive interface makes it easy to use, and it's compatible with Android 9.0. Overall, PDF to Voice is a useful app for anyone looking to convert their written documents to speech. Although the developer, SdSk Developers, welcomes feedback and suggestions to improve the app, I found it to be a reliable and efficient tool for its intended purpose.