I stopped manually organizing 90+ NotebookLM notebooks once I found these two underrated tools

NotebookLM lacks built-in organizational features, which becomes a real problem for heavy users managing 90+ notebooks. Two workarounds help: a browser extension called NotebookLM Tools that adds batch selection, filtering, and a proper dashboard interface; and Gemini's read-only integration with NotebookLM, which can analyze notebook sources, flag outdated or irrelevant content, and help prioritize what to clean up — even though deletions still have to be done manually.