Gemini Notebook (formerly NotebookLM) vs Perplexity AI

Perplexity AI edges out Gemini Notebook (formerly NotebookLM) by 0.7 points (8.5 vs 7.8) -- a A-tier vs B-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for Perplexity AI's strengths, so if those categories are your priority, the lead translates.

Pricing-wise, both tools have a free tier (Gemini Notebook (formerly NotebookLM) starts $0, Perplexity AI starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.

By use case: pick Gemini Notebook (formerly NotebookLM) when students researching papers, professionals who need to quickly digest long documents, and anyone who wants to turn a pile of pdfs into something they can query and listen to. Pick Perplexity AI when researchers, students, professionals, and anyone who needs factual answers with sources. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Perplexity AI's lane, the tier-list ranking and the use-case fit point the same direction; if you're in Gemini Notebook (formerly NotebookLM)'s lane, the score gap matters less than the fit.

Bottom line: Perplexity AI is the safer default for most readers, but Gemini Notebook (formerly NotebookLM) is competitive enough that the tie-breaker is your specific workload, not the spec sheet.