Comparison
RefChat vs NotebookLM
An honest comparison to choose between Google's solution and the sovereign French alternative.
NotebookLM (Google) is free, elegant, and even offers audio summaries as podcasts — excellent for occasionally exploring a few documents. But as soon as it's about a real scientific library, when confidentiality matters, or when you go beyond a few dozen PDFs, the limits show fast. RefChat is built for those cases.
Point by point
Comparison table
| Criterion | RefChat | Google NotebookLM |
|---|---|---|
| Confidentiality | 100% local option — no data leaves your machine | Google cloud only — every PDF goes through Google |
| Hosting (cloud mode) | OVHcloud, Roubaix (France) — GDPR | Google datacenters (mostly USA) |
| Source volume | 5,000 to 20,000+ PDFs with ease | Limited (~50 sources per notebook) |
| Cited sources | Explicit citation of the exact passage + link to the PDF | Citations, but coarser granularity |
| Hybrid search | BM25 + dense (E5-large) + reranking | Dense RAG (Gemini), no BM25 or reranker |
| OCR for scanned PDFs | Built-in EasyOCR | Partial — variable quality on old scans |
| Scientific parsing (GROBID) | Yes — title, authors, references, sections | No — generic PDF parsing |
| Zotero / Mendeley integration | Native — point to your storage/ folder | Manual — upload PDF by PDF |
| Multilingual | Native EN/FR, E5 embeddings | Good (Gemini), often biased towards English |
| Audio overview / podcast | No | Yes — NotebookLM's strong point |
| Cost | €10/month (Solo Local) to quote (Team) | Free (quotas) / paid via Google One |
| GDPR compliance | Documented | Unclear for European professional use |
| Training on your content | Never — contractual clause | Google policy varies |
When NotebookLM is enough
- Quickly testing a dozen articles with nothing to install
- Public documents, confidentiality not critical
- You love the podcast / audio overview format
- Small one-off volumes, mostly in English
- No need for Zotero integration or large volumes
When RefChat is the answer
- Confidential PDFs (internal reports, patents, legal, medical)
- A real scientific library (1,000 to 20,000+ articles)
- You use Zotero / Mendeley and want it to just work
- Old scanned PDFs (expert reports, industrial archives)
- Need for documented GDPR compliance
- Precise citations down to the passage, not the article
In short
NotebookLM = excellent for occasional, public, exploratory use.
RefChat = a professional tool for researchers, engineers and experts with a real library and confidentiality or volume constraints — the sovereign European alternative when NotebookLM is no longer enough.
Try RefChat on your own bibliography
Live demo (30 min) + a trial on a sample of your PDFs, under NDA if needed. No commitment.
Request a demo