Klattersynth TTS is the first asset of its kind available for the Unity® cross-platform engine:
Small and fully embedded speech synthesizer.

What features does Klattersynth TTS have?

• It does not use OS or browser speech synth, so it sounds the SAME on all platforms.
• Dynamically talks what you ask it for.
• Generates and plays streamed speech in real-time.
• In WebGL builds the AudioClips are quickly pre-generated and then played.
• Contains English Text-To-Speech algorithm (transform to phonemes).
• Alternatively you can enter documented phonemes directly, skipping the rules for English TTS conversion.
• You can ask current loudness of the speech for tying effects to audio.
• Uses normal AudioSource components: 3D spatialization, audio filters and reverb zones work like usual!
• Contained in one ~100 KB cross-platform DLL file.
• When embedded with your game or app and compressed for distribution, compresses down to less than 30 KB.
• Supports all Unity versions starting from 5.0.0 and available for practically all platforms targeted by Unity.
• Also supported by RT-Voice PRO

Why Klattersynth TTS is different from many other speech-related assets for Unity?

• No need for the underlying platform to offer speech features (OS or browser).
• No need for a network connection for external generation of audio clips.
• No need to pre-generate the samples before creating a build of your app or game.

Support Thread in Unity Forums

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Below are videos of some example scenes.

Alternatively you can test the example scenes in a WebGL build yourself.

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VERSION HISTORY

// 2024-03-17, 1.1.1 - Verified support for Unity 6.
// 2019-11-11, 1.1.1 - Support for Enter Play Mode without Domain/Scene Reload. Fix for warning when importing package on Unity 2019.3+
// 2019-07-04, 1.1.0 - Fixes for streaming mode when used with Unity 2018.3+. Compatibility verified up to Unity 2019.2 (2019/07).
// 2017-07-28, 1.0.0 - Initial release.


NOTE:
The asset is supported and kept up-to-date, even if you are not seeing list of frequent updates.
The aim is to create robust releases which need updates only infrequently.