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vapi-alternative

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dograh-hq / dograh

Star 5.9k

Open source voice AI platform. Self-hosted alternative to Vapi and Retell. On Prem, BYOK across Speech to Speech or LLM/STT/TTS, with a visual workflow builder, MCP native and telephony support.

python open-source text-to-speech self-hosted telephony speech-to-text no-code conversational-ai asterisk-ari outbound-calls inbound-calls speech-to-speech pipecat voice-ai-platform local-llm voice-agents ai-calling open-source-voice-ai vapi-alternative on-prem-voice-agent-platform
  • Updated Oct 20, 2026
  • Python

PatterAI / Patter

Star 1.1k

Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.

python open-source text-to-speech typescript sdk twilio openai speech-to-text telnyx voicebot realtime-api voice-ai ai-agent voice-agent llm ai-phone-agent mastra vapi-alternative openclaw hermes-agent
  • Updated Oct 3, 2026
  • Python

blackdwarftech / siphon

Sponsor
Star 60

The open-source foundation for production Voice AI. Build, scale, and own your AI calling infrastructure. Bridge legacy SIP to modern LLMs over ultra-low latency WebRTC pipelines. Zero platform fees, BYOK, and full data sovereignty.

infrastructure twilio sip webrtc self-hosted telephony openai speech-to-text python-framework ai-agents cpaas voice-bot voice-ai voice-agent livekit llm ai-calling vapi-alternative siphon-ai retell-alternative
  • Updated May 12, 2026
  • Python

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