Introducing Klattersynth TTS for Unity, now available in the Unity Asset Store.
It’s a really small and fully embedded speech synthesizer (a text-to-speech engine).
In contrast to some other speech assets, it does not need a network connection for generating speech using a 3rd party website, and it also does not use the speech synthesizer embedded in the Operating System (which differs based on what OS and what OS version you’re using).
Instead it’s fully embedded and runs probably on all platforms targeted by the Unity engine. It can generate and stream the speech real-time or it can pre-generate & cache clips and play them later. The audio clips are also played using a normal Unity AudioSource component, so they’ll also work with the 3D spatialization and reverb zones. Klattersynth TTS is contained in a ~100 KB “cross-platform” DLL file for Unity, which zip-compresses down to less than 30 KB!
You can try a WebGL demo build yourself in Klattersynth TTS website, or view showcase videos in YouTube.