Conversation
Watson Assistant
Dialogflow ES
Dialogflow CX
Microsoft CoPilot
Microsoft Azure Bot Services
AWS Lex
Kore.AI
OpenAI
Other conversation services (via custom built Orchestration server or Cutsom Skill)
Voice / Text to Speech / TTS
Google
Microsoft
AWS
No support for custom TTS
Speech Recognition / Speech to Text / STT
Microsoft
Google
Deepgram
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