TTSLab lets you run and compare TTS & STT models directly in your browser using WebGPU and WASM — no server, no API keys, no data collection. Your text and audio never leave your device. Run Kokoro 82M, Whisper, Moonshine, and more. Models are downloaded once and cached locally. Compare voices side by side, run benchmarks, or chat with a Voice Agent — all on-device. Built for developers, researchers, and product teams. Fully open source (MIT).