YouTube Shadowing Practice - EchoFlow AI Pronunciation Feedback

Tracking since Apr 8, 2026.

Changelog

• Apr 19, 2026
  description

  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.

  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!

• Apr 19, 2026
  short_description

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

  Master English shadowing on YouTube. Repeat lines, record your voice, and get instant AI feedback to speak with confidence.

• Apr 19, 2026
  name

  EchoFlow

  YouTube Shadowing Practice - EchoFlow AI Pronunciation Feedback

Permissions & access

Permissions

storagetts

Host access

https://www.youtube.com/*, https://huggingface.co/*, https://api.mymemory.translated.net/*, https://www.google-analytics.com/*

Screenshots