I use TTS within the Android Kindle app. It's splendid.
The very affordable Heather Scottish TTS voice for Android by Cereproc is lovely. https://play.google.com/store/apps/details?id=com.cereproc.Heather&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dgoogle+play+cereproc+heather&pcampaignid=APPU_1_E_7SVIvNPPPhsATlxYCQAg
Please cast a vote.
https://logosmobile.uservoice.com/forums/190765-logos-mobile-apps/suggestions/3671914-enable-read-aloud-or-text-to-speech-like-in-the-de
I do not know how to use this forum? I am trying to find a Text to speech program that does not sound like a robot.