Lintro

##English Version
Lintro is a language-learning extension for YouTube and Bilibili. It overlays clear bilingual subtitles on top of videos so you can listen and understand at the same time, making everyday input smoother and more effective.

You can translate subtitles into multiple target languages to match your learning goals (e.g., English, Japanese, Korean, French, Spanish, and more). Lintro also includes AI-powered assistance: when you encounter difficult sentences or want deeper insights, it can provide sentence-level explanations and learning hints. You may use your own LLM API key for these features, and Lintro does not collect or upload your key.
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##中文版
Lintro 是一款面向语言学习者的 YouTube 与 Bilibili 双语字幕学习插件。它会在视频页面上叠加清晰的双语字幕显示，帮助你在“听懂内容”的同时快速对照理解表达方式，提升输入效率与学习连贯性。

你可以将字幕翻译到多种目标语言，适配不同学习方向（如英、日、韩、法、西等）。此外，Lintro 集成了 AI 辅助能力：当你遇到难句或想深入理解语法与用法时，可获得句子层面的解析与学习提示。你也可以使用自己的大模型 API Key 来启用相关能力；Lintro 不会收集或上传你的 Key 信息。