YouTube 英語学習サポーター

YouTube / Netflix / Prime Video / Kaltura MediaSpace などの英語字幕を自前オーバーレイで表示し、CEFR難易度色分け・辞書・学習者レベル推定・読み上げで英語学習を支援します。

Who it is for: - Learners who want more than plain captions — vocabulary, difficulty, and listening practice - People who start on YouTube and may later expand to Netflix, Prime Video, or MediaSpace What you get (Free): - Custom caption overlay on YouTube (native captions hidden) - CEFR-based word coloring (A1–C1+) - Bundled EN dictionary with Japanese glosses (hover / click) - Known-word tracking and per-video word panels - Learner-level estimate (simple summary) - Browser built-in caption TTS - Clip save (up to 20) - Listening-first mode (delayed or blurred captions) About Pro: Free covers core YouTube learning. Pro unlocks: - Netflix / Prime Video / Kaltura MediaSpace - Unlimited clip saves - Google Cloud TTS (API key required) - Detailed CEFR / school-level analysis charts - Sentence repeat (seek to cue / loop one sentence) - Phrase and grammar highlighting Checkout uses Stripe; authentication uses Firebase. Permissions (why): - storage / tabs / scripting / alarms: save settings, inject content scripts, scheduled work - Host permissions for video sites: fetch captions and render the overlay - Dictionary / translate / TTS APIs: lookups and speech when needed - optional_host_permissions: MediaSpace origins only after you explicitly allow them Privacy: Learning data stays on-device by default. Auth/purchase for Pro sends only what Firebase / Stripe need. See the privacy policy for details. Support: conexsoft@fujigoma.com