Audio & video assistant
Your personalized audio & video AI assistant
You only know it when you can teach it back.
Add to Chrome
Add to Edge
YouTube
BilibiliWhy install
The hard part of learning from video is rarely the content
Each friction has a matching move in Lumi.
- 01
You cannot keep up in another language
Hear the original, read the meaning
No captions? Transcribe first. Then refine the breaks and show a bilingual track. Stuck on a line? Click it and hear it again.
- 02
One question and you leave the page
Ask beside the video
No new tab. Answers carry timestamps, so one click takes you back to the sentence.
- 03
Video is worse than text for finding things
Make the video searchable
Chapters, a readable article, and clickable timestamps. Replay a moment without dragging the scrubber.
- 04
The page is too loud
Keep attention on this passage
Lumi stays in the side rail. Recommendations, danmaku, and the next-up teaser stop pulling you away.
- 05
You forget it two days later
Pick the lesson back up
After you sign in, history and the library remember where you were and what you asked.
FAQ
Things people usually ask
All core features are free to try. Free accounts receive 200,000 Lumi AI tokens, while Pro includes 10,000,000 tokens each month. Bringing your own API key is always unmetered.
YouTube and Bilibili are supported now. Vimeo, Coursera, and other course platforms are next on the roadmap.
You can use Lumi AI with zero setup, or bring your own key for DeepSeek, OpenAI-compatible, Anthropic and Gemini models — pick whichever fits you in extension settings.
While signed out, progress stays on this browser. After you sign in, recent study and library items sync so you can continue on another device. We do not sell that data.
Yes. When the platform provides captions Lumi uses them; for videos with no captions at all, Lumi generates subtitles from the audio first, then translates, summarizes and chats over them.
LUMI
Let Lumi watch videos and listen to audio with you
Install Lumi for free and dive into an immersive audio and video experience.