| Platform | Description | |———-|————- | | ElevenLabs | Voice platform with conversational AI, multimodal support, batch calling, and compliance-oriented deployment options. | | Vapi | Developer-first. Low-latency, model-agnostic. | | Bland AI | Outbound call automation. CRM integration. SOC2/HIPAA. | | Voiceflow | No-code voice and chat builder. Drag-and-drop. | | Synthflow | No-code voice agents for SMBs. Templates. | | PolyAI | Enterprise. Natural multi-turn. Hospitality/retail. | | Retell AI | Human-like voice agents. Multi-language. Telephony. | | HeyGen | Talking avatars. Voice cloning. Lip-sync translation. | | Synthesia | AI video avatars. 120+ languages. Enterprise. | | Deepgram | STT and TTS APIs. Sub-300ms latency. | | AssemblyAI | STT with diarization, sentiment, summarization. |
| Tool | Description | |——|————-| | LiveKit Agents | OSS real-time voice/video AI agents. | | Rasa | OSS conversational AI. Self-hosted. NLU training. | | Pipecat | OSS voice and multimodal conversational AI. | | Vocode | OSS voice-based LLM agents. |