Gemini Notebook (formerly NotebookLM) ranks #1 for chat with a PDF (score 8.8/10). Pricing: Unverified; free tier: Unverified. Runners-up: Adobe Acrobat AI Assistant, ChatPDF.
Top 5, ranked by our published rubric. Sponsorship never affects the order. Last updated 2026-10-13.
Why ranked: Its own site says: “Use the power of AI for quick summarization and note taking, Gemini Notebook is your powerful virtual research assistant rooted in information you can trust.” We placed it 1st of 5 on fit for this task. Pricing unverified.
Fit 10.0 · value 5.0 · breadth 10 · availability 10 (how we score) · no readable pricing page · site live
Why ranked: Adobe Acrobat AI Assistant: AI in Acrobat for PDFs. We placed it 2nd of 5 on fit for this task. No free plan confirmed; paid from Acrobat plans from US$14.99/mo.
Fit 8.5 · value 6.2 · breadth 6 · availability 7 (how we score) · pricing source · site bot-blocked (403)
Why ranked: Its own site says: “ChatPDF brings ChatGPT-style intelligence and PDF AI technology together for smarter document understanding.” We placed it 3rd of 5 on fit for this task. Pricing unverified.
Why ranked: Its own site says: “No commitment · Cancel anytime Everything in Free, plus: More usage Hand off tasks and get back finished docs, slides, sheets, and designs Claude Code Claude Science Projects More Claude models Claude in Chrome and Microsoft 365 Max ” We placed it 5th of 5 on fit for this task. Free tier; paid from $17/mo billed annually ($20 monthly).
Fit 4.0 · value 10.0 · breadth 10 · availability 7 (how we score) · pricing source · site bot-blocked (403)
Why ranked: Its own site says: “Humata is an AI agent that turns your documents into a fast, intelligent knowledge base for instant analysis, insights, and answers.” We placed it 4th of 5 on fit for this task. No free plan confirmed; paid from Expert $9.99/mo.