YouTube Shadowing Practice - EchoFlow AI Pronunciation Feedback

EchoFlow turns any YouTube video into a powerful English shadowing practice studio. Master natural pronunciation, rhythm, and fluency — the way native speakers actually talk. Whether you're preparing for IELTS, TOEIC, improving daily conversation, or simply wanting to sound more confident, EchoFlow makes shadowing effective, enjoyable, and completely private. Why EchoFlow Works So Well - Smart Line-by-Line Shadowing: Automatically detects sentence boundaries, pauses for you to repeat, and supports custom repeat loops and playback speed. - Voice Recording & Instant Comparison: Record yourself and play side-by-side with the original audio to clearly hear your progress. - On-Device AI Pronunciation Feedback: Powered by a Whisper-class model (Transformers.js + ONNX). Receive word-level scores on pronunciation, rhythm, and fluency — all processed locally in your browser. - Helpful Learning Tools: Tap any word for Chrome text-to-speech pronunciation, optional free word translation, adjustable subtitle size, and context lines. - Flexible & Clean Interface: Drag the practice panel anywhere, adjust opacity, choose different Whisper model tiers, and more. - Fully Local Storage: Your practice history is saved only in your browser. No account or login required. Pricing & Future Plans EchoFlow is completely free to use right now — no limitations, no hidden fees. Start improving your English speaking today! We plan to introduce optional paid advanced features in the future (such as more powerful models, extra analytics, or additional customization options) to support ongoing development. The core shadowing experience — including line-by-line practice, voice recording, and on-device AI feedback — will always remain free. Privacy First All speech recognition runs 100% on your device. Model files are downloaded directly from Hugging Face only when needed. Your voice recordings are never uploaded to our servers. Start your daily shadowing practice today and finally break through your speaking barrier — one YouTube video at a time!