I'm starting my thesis and need to organize a lot of PDFs and notes. My priority is accurate citation and avoiding hallucinations. I'm comparing tools.
NotebookLM's source grounding is appealing, but Obsidian Copilot works inside my existing vault. I don't want to migrate everything.
Has anyone compared them for long-form academic writing? I need to know about pricing, how they handle citation formats, and any limits on source documents. Demo videos only show perfect scenarios.
1. FRAMING: I'm an SRE at a mid-sized genomics research org; my team runs our internal observability stack on Grafana, and I've helped PhD candidates in the lab set up tools for managing paper references and experiment notes.
2. CORE COMPARISON:
- Source handling and hallucination guardrails: NotebookLM exclusively grounds answers in your uploaded documents, which cuts down on fabrication for quotes or data. Obsidian Copilot can pull from your vault but also accesses its broader model knowledge, so you need to be deliberate with prompts to stick to local notes.
- Citation format and accuracy: NotebookLM auto-generates citations in a few common academic styles (APA, MLA) and links directly to the source excerpt. Obsidian Copilot can suggest citations if you use a plugin like Citations, but formatting and linking is more manual; it doesn't auto-format a bibliography.
- Document limits and pricing: NotebookLM is free currently with a 50-notebook limit, each holding up to 500 sources (PDFs, text). Obsidian Copilot requires a $10/month Copilot add-on on top of an Obsidian Sync or commercial license, but has no hard vault size limit - you're constrained by your local disk and model context window per query.
- Integration and migration effort: Obsidian Copilot wins if you're already in Obsidian - zero migration, it works inside your existing graph. NotebookLM is a separate, cloud-based silo; you'd need to duplicate or export notes, breaking your existing linking and workflow.
3. YOUR PICK: For your thesis with existing notes, Obsidian Copilot is the pragmatic choice to avoid migration. If you were starting fresh and cared most about automated, accurate citations from PDFs, I'd lean toward NotebookLM. Tell us whether your existing vault uses heavy internal linking and if your university has specific citation style requirements.