Perplexity ranks #1 for research a topic with sources (score 9.7/10). Pricing: $17/mo (Pro, billed annually); free tier: yes. Runners-up: Gemini, Gemini Notebook (formerly NotebookLM).
Top 5, ranked by our published rubric. Sponsorship never affects the order. Last updated 2026-10-13.
| # | Tool | Score | Pricing | Paid from | Free tier | What it is |
|---|---|---|---|---|---|---|
| 1 | Perplexity | 9.7 | Free tier | $17/mo (Pro, billed annually) | yes | AI answer engine with citations |
| 2 | Gemini | 8.5 | Free tier | AI Plus $4.99/mo (AI Pro $19.99/mo) | yes | General AI assistant by Google |
| 3 | Gemini Notebook (formerly NotebookLM) | 8.0 | Unverified | Unverified | Unverified | Research notebook grounded in your sources |
| 4 | ChatGPT | 7.8 | Free tier | Go $8/mo (Plus $20/mo) | yes | General AI assistant by OpenAI |
| 5 | You.com | 6.7 | Free tier | $5 per 1K calls (usage-based API) | yes (API free credit) | AI-ready web search APIs |
AI answer engine with citations
Why ranked: Perplexity: AI answer engine with citations. We placed it 1st of 5 on fit for this task. Free tier; paid from $17/mo (Pro, billed annually).
Fit 10.0 · value 10.0 · breadth 10 · availability 7 (how we score) · pricing source · site bot-blocked (403)
General AI assistant by Google
Why ranked: Gemini: General AI assistant by Google. We placed it 3rd of 5 on fit for this task. Free tier; paid from AI Plus $4.99/mo (AI Pro $19.99/mo).
Fit 7.0 · value 10.0 · breadth 10 · availability 10 (how we score) · pricing source · site live
Research notebook grounded in your sources
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 2nd of 5 on fit for this task. Pricing unverified.
Fit 8.5 · value 5.0 · breadth 10 · availability 10 (how we score) · no readable pricing page · site live
General AI assistant by OpenAI
Why ranked: Its own site says: “Use ChatGPT to answer questions, write, create images, complete work, and code—all in one place.” We placed it 4th of 5 on fit for this task. Free tier; paid from Go $8/mo (Plus $20/mo).
Fit 5.5 · value 10.0 · breadth 10 · availability 10 (how we score) · pricing source · site live
AI-ready web search APIs
Why ranked: Its own site says: “Skip the groundwork with our AI-ready Web Search APIs, delivering advanced search capabilities to power your next product.” We placed it 5th of 5 on fit for this task. Free tier; paid from $5 per 1K calls (usage-based API).
Fit 4.0 · value 10.0 · breadth 8 · availability 10 (how we score) · pricing source · site live
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By TaskRanking's published rubric, Perplexity ranks first, followed by Gemini and Gemini Notebook (formerly NotebookLM).
Yes: Perplexity has a free tier per its own pricing page (checked 2026-10-13).
Score = 50% fit, 25% value (from vendor pricing pages), 15% breadth, 10% availability. Sponsorship never affects rank.
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