Android devices generally have TTS engine(s) preinstalled.
You can download Google's TTS engine from the Google Play Store and follow it's installation guide: https://play.google.com/store/apps/details?id=com.google.android.tts
Make sure to have selected the correct TTS engine (a) within the app and (b) inside your device's settings.
In your Android Device, go to Settings > Languages > Text-To-Speech > (Select same engine like in the app first) > Cog wheel > Install Voices/Customize to your liking
iOS devices generally have TTS engine(s) preinstalled.
Make sure to have selected the correct TTS engine (a) within the app and (b) inside your device's settings.
In your iOS device, go to Settings > General > Accessibility > Speech > Install Voices/Customize to your liking
Premium TTS is offered for subscribed users, this TTS uses a more sophisticated AI to mimic the natural human voice. This service requires an active internet connection, but you can optionally toggle between Premium TTS and Standard TTS (as outlined above) within the profile/settings page inside the app.
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