TTS Engines Overview

TTS Wrapper supports multiple text-to-speech engines, each with its own features, capabilities, and authentication requirements. This section provides detailed documentation for each supported engine.

Quick Feature Comparison

Engine	SSML Support	Streaming	Word Timing	Platform	Type
AWS Polly	✅ Full	✅	✅	Cloud	Commercial
Google Cloud	✅ Full	✅	✅	Cloud	Commercial
Microsoft Azure	✅ Full	✅	✅	Cloud	Commercial
IBM Watson	✅ Full	✅	✅	Cloud	Commercial
OpenAI	❌	✅	❌	Cloud	Commercial
ElevenLabs	❌	✅	❌	Cloud	Commercial
Play.HT	❌	✅	❌	Cloud	Commercial
Wit.ai	❌	❌	❌	Cloud	Commercial
eSpeak	✅ Basic	❌	❌	Local	Open Source
SAPI	✅ Limited	❌	❌	Local (Windows)	System
AVSynth	✅ Limited	✅	✅	Local (macOS)	System
GoogleTrans	❌	❌	❌	Cloud	Free
Sherpa-ONNX	❌	✅	❌	Local	Open Source

Choosing an Engine

Consider the following factors when choosing a TTS engine:

1. Platform Requirements

   • Cloud engines require internet connectivity and API keys
   • Local engines need specific operating systems or dependencies

2. Feature Requirements

   • SSML support for speech control
   • Streaming capabilities for real-time synthesis
   • Word timing for synchronization

3. Cost Considerations

   • Commercial cloud services charge per character/request
   • Local engines are typically free but may have quality tradeoffs

4. Quality and Voice Options

   • Cloud services often offer higher quality and more voices
   • Local engines may have limited voice selection

Engine Documentation

Each engine's documentation page includes:

• Authentication setup
• Available features
• Code examples
• Platform-specific notes
• Known limitations
• Best practices

Select an engine from the sidebar to view its detailed documentation.