EchoFlow

Language shadowing practice on YouTube. Free for now; advanced paid features may be added later.

EchoFlow helps you practice language shadowing on YouTube. • Reads YouTube captions on watch pages and shows them in a practice panel. • Line-by-line mode: pause at sentence boundaries and repeat lines as configured. • Record your voice and compare playback with the original line. • On-device speech recognition using a Whisper-class model (Transformers.js + ONNX); model files download from Hugging Face when you practice. Your raw recordings are not uploaded to EchoFlow servers. • Word-level feedback; optional free word translation when you request it (third-party API). • Optional Chrome text-to-speech when you tap a word for pronunciation. • Settings: UI language, subtitle size, context lines, panel placement, backdrop opacity, Whisper model tier, and more. • Practice history stored locally in your browser. • Optional Google Analytics 4 usage events only in builds that ship with a Measurement ID; otherwise no analytics traffic. Pricing: free for now; advanced paid features may be added later.