SMRTR ProgrammingAug 6, 2026LogRocket

How to build a real time voice AI agent in the browser

SMRTR summary

Building a fully local voice AI agent in the browser is now possible using Transformers.js v4 with WebGPU. This guide walks through wiring together Whisper for speech-to-text, a quantized 0.5B LLM for reasoning, and the browser's built-in SpeechSynthesis API — all without a single network request. A three-state machine prevents the agent from hearing itself, and a WASM fallback handles unsupported hardware.

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