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从 YouTube 和 Bilibili 视频里拾取表达、批注字幕并导出学习记录。 Captiono 是面向英语学习者的视频字幕研读工具，支持自动读取 YouTube 和 Bilibili 当前视频已有字幕。你可以按时间跳转字幕、标记重点英语表达、悬浮查看中文语境义、对整句或精确选区添加批注，并将字幕、短语与笔记复制或导出为 Markdown/JSON，交给任意 AI 继续分析。所有学习记录保存在 Chrome 本地存储中；Captiono 不上传字幕、批注或浏览记录，也不进行音频转写。
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.