The flagship feature is the AI notebook: add links to video, PDF, and web pages (several at once if you need to), get a breakdown of each source, then ask questions across the whole set in the notebook's shared chat — answers come from the actual content, not the model's general knowledge. Essentially a direct NotebookLM alternative.

The original single-source tools are still there: a video, PDF, or web page can be analyzed on its own, without a notebook and without an account. A Chrome extension analyzes the YouTube page or PDF you already have open, no copying links into a separate tab.

For anyone who comes back to their material regularly, there's Second Brain: highlight a fragment in the notebook or in a standalone analysis, and the system links it by meaning to other saved fragments, groups it by topic, and resurfaces it later when it's relevant again — the personal archive stops being a pile everything goes into and nothing comes back out of. Plus export to PDF/Markdown/DOCX and results in 12 languages at three levels of detail.

Without an account: 1 source/day (videos up to 60 min, PDFs up to 5 MB). With a free Study account: still 1 source/day, but videos up to 240 min and PDFs up to 15 MB, plus up to 5 notebooks (up to 5 sources each) and a Second Brain capped at 50 saved thoughts. The Pro plan (399 RUB/month) removes the daily source cap, raises the limits to 420-minute videos and 300 MB PDFs, allows up to 50 notebooks (up to 20 sources each), unlimited Second Brain, a connections graph, and a priority queue.