Usar la aplicación APKPure
Obtener TTS Speech Synthesizer versión histórica en Android
Escribe lo que quieras y hacer que su teléfono decirlo. Aún guarda en mp3!
Write what you want and your phone says it: with this easy speech synthesizer your Android will tell you anything using an integrated TTS engine (Text-to-speech engine).
WARNING: The speaker's voice is the one installed in your Android phone and it is not possible to change it! Please don't rate bad this app because of that.
As for language, speed and other options settings please have a look to your system settings (that change on every new Android version).