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VoiceLoop: Open-Source Browser Voice Agent Library Rivals OpenAI Realtime on Latency

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TodoForAI has open-sourced VoiceLoop, a zero-dependency JavaScript library that runs a full voice agent pipeline — VAD, speech-to-text, LLM, and text-to-speech — entirely in the browser. The library is designed for low latency, with first audio responses delivered in under a second by streaming TTS output while the LLM is still generating. A key feature is real barge-in detection based on transcribed words rather than microphone energy, which prevents the agent from cutting itself off due to speaker echo. Independent benchmarking via the team's own voice-agent-bench tool showed VoiceLoop with Deepgram and ElevenLabs matching OpenAI Realtime at roughly 862ms voice-to-voice latency while recording zero self-interruptions across 30 echo-coupled turns. The library is available on npm and supports any OpenAI-compatible LLM endpoint, with local WASM-based options requiring no API keys.

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