Hey Product Hunt 👋 I'm Hung, the maker of Notebook OS.

Gemini Notebook is one of the best thinking tools I've used, it reasons over my sources instead of the whole internet. But it's a brilliant brain with no operating system around it. Getting material in is manual. It forgets how I work. What it generates stays stuck in a tab.

Notebook OS is that operating system. One Chrome side panel, five layers:

📥 SOURCES — search YouTube and academic databases and add results as native sources. Snip any page or image. Hit record and a voice note lands in your notebook. Import a chat you had somewhere else.
🧠 SKILLS — save how you work as a reusable instruction and apply it to a notebook. It becomes a source, so Gemini Notebook keeps following it through your follow-ups, tomorrow's session, and every artifact you generate. Not a prompt you re-paste — a standing instruction. 15 built in, or write your own in two sentences.
🎛️ STUDIO — recipes that turn a notebook into audio overviews, slide decks, reports, mind maps, concept maps, flashcards and quizzes, in 50+ languages, with the right prompt written for you.
🖥️ OUTPUT — present your decks full-screen and watermark-free. Pull clean transcripts and study notes out of any video.
🗂️ LIBRARY — folders, tags, a visual map of every notebook, and an Artifact Shelf that pins what you make across all of them.

Each one is small on its own. Together they're the difference between a chat box and a workspace.

It's free, no credit card, and everything stays in your own Gemini Notebook account.

I'd love your honest feedback — which layer would you actually use, and what's still missing? 🙏