Free plans only

8 Best Free AI Research Assistants of 2026

By the Rankozo research desk · Updated November 9, 2026

8 of the 10 tools in our best ai research assistants ranking offer a permanent free plan. Consensus scores highest among them at 9.0 out of 10.

1. 01

   Consensus

   Students and clinicians who want quick, cited answers from published studies.

   Free plan; Pro $12 per month billed annually ($144 a year); Deep $45 per month billed annually

   Full entry, No. 1 overall

   Paid from

   $12

   Score 9.0

2. 02

   NotebookLM (Gemini Notebook)

   Students and analysts who already have their readings, reports or notes and want summaries, study aids and reports from them.

   Free with a Google Account; higher limits with Google AI Plus at $4.99 per month or Google AI Pro at $19.99 per month

   Full entry, No. 2 overall

   Paid from

   $4.99

   Score 8.9

3. 03

   Elicit

   Graduate students and research teams running structured or systematic literature reviews.

   Free plan; Plus $11 per user per month billed annually ($132 a year); Pro $39 per user per month billed annually

   Full entry, No. 3 overall

   Paid from

   $11

   Score 8.8

4. 04

   Perplexity

   Analysts and students who need fast, cited answers from current web sources.

   Free plan; Pro $17 per month equivalent billed annually; Max $167 per month equivalent billed annually

   Full entry, No. 4 overall

   Paid from

   $17

   Score 8.8

5. 05

   Gemini Deep Research

   Students and analysts in Google's ecosystem who want long web reports that can also draw on Gmail and Drive.

   Deep Research included in the free Gemini plan; Google AI Plus $4.99 per month, Google AI Pro $19.99 per month

   Full entry, No. 5 overall

   Paid from

   $4.99

   Score 8.7

6. 06

   ChatGPT deep research

   People who already use ChatGPT for writing and coding and want research reports in the same app.

   Free plan with limited deep research; Go $8 per month in the US; Plus $20 per month with expanded deep research

   Full entry, No. 6 overall

   Paid from

   $8

   Score 8.6

7. 07

   Undermind

   Scientists and graduate students who need high recall on complex literature searches.

   Free plan; Pro $16 per month billed annually; Team $15 per person per month billed annually

   Full entry, No. 7 overall

   Paid from

   $16

   Score 8.4

8. 08

   ResearchRabbit

   Students who want a free, visual way to map a field and find papers they missed.

   Free Forever plan; RR+ $10 per month on the annual plan in the US, UK and Canada ($12.5 monthly)

   Full entry, No. 8 overall

   Paid from

   $10

   Score 8.3

Scores and prices come from our Best AI Research Assistants ranking, which uses one method for every tool. Questions or corrections: editorial@rankozo.com