Free AI Research Tools in 2026: Elicit, Semantic Scholar, NotebookLM, Consensus and Scite

AI research tools promise to read the literature for you, but most "free" ones are a few searches or a short trial. We read each vendor's own pages on 2026-11-01. Three have a real free plan: Elicit (Basic), Semantic Scholar (free search, plus a free API) and NotebookLM, which Google's help center now calls Gemini Notebook. Scite has no free plan, only a 7-day trial. Consensus is left out: its pricing page is rendered by script and we could not read its limits.

None of these is in our verified catalog yet, so the table links each vendor's page. Offer drafts for Elicit, the Semantic Scholar API and NotebookLM are ready for import. Student plans for general assistants are in the student AI deals hub.

The free options at a glance #

Source: the vendor pages listed under each section, read 2026-11-01.

Elicit: free search and paper chat, limited agents #

Elicit's pricing page describes Basic, "for casual exploration", as free with unlimited search across more than 138 million papers, unlimited summaries "across as many papers as you want", unlimited chat with papers with full-text access, sources for answers and Zotero import. The limit is the heavier tooling: Research Agent and Research Reports have "limited usage" on Basic, and Elicit does not say how much. Plus ($11 a user a month, billed $132 annually) adds export to RIS, CSV, BIB, PDF and DOCX and "standard usage" of the agent and reports; Pro is for systematic reviews. For a literature scan, Basic's search and summaries are enough; the agents are the part to ration.

Source: Elicit pricing, checked 2026-11-01.

Semantic Scholar: free search, and a free API for your own tools #

Semantic Scholar describes itself as "a free, AI-powered research tool for scientific literature, based at Ai2". You search without an account; a free account adds email alerts for new papers, research feeds, a saved-paper library and the ability to claim an author page. There is no mobile app, but the website works on phones.

Developers get a free Academic Graph API with data on papers, authors, citations and venues, plus Recommendations and Datasets services. Most endpoints work without a key, "rate-limited to 1000 requests per second shared among all unauthenticated users", and "requests may also be further throttled during periods of heavy use". An API key, which arrives by email after you request it, gets higher limits; the introductory limit is 1 request per second on all endpoints. Send the key with every request, and cache results so a script stays under the limit.

Source: Semantic Scholar FAQ, Semantic Scholar API, checked 2026-11-01.

NotebookLM: your own sources, with citations #

Upload PDFs, websites or Google Docs and chat over only those sources, with citations back to the passage. Google's help center now documents the product as Gemini Notebook, and the free plan is "free of charge by using your gmail account". The standard limits on its plans page are 100 notebooks per user and 50 sources per notebook (Plus: 200 and 100; Pro: 500 and 300). Chat usage is limited by compute with no number published, and Google labels all limits "subject to change". Daily quotas reset after 24 hours, monthly quotas after 30 days.

Privacy: Google says data "is not used to train Gemini Notebook unless you provide feedback", in which case it may review the interaction. If you live in India, South Korea or Vietnam, generated images and videos carry a visible watermark. For alternatives built from free vector databases and embeddings, see free NotebookLM alternatives.

Source: Learn about Gemini Notebook's plans, checked 2026-11-01.

Scite and Consensus: not free to rely on #

Scite's pricing page lists Basic at $12 a month billed yearly with a "7-day trial" (full Assistant and Search access, 250 MCP credits a month, collections up to 1,000 papers), and Pro at $40 a month billed yearly. It offers no free plan, so use the trial for one project and cancel in time.

Consensus's pricing page loads its plan cards with script, so we could not read what its free tier includes. Its site invites you to "Search for free", but we state no limits for it; check the plan page after you sign up.

Source: Scite pricing, checked 2026-11-01; Consensus, not readable.

Which one to use #

• Scanning a topic and summarizing papers: Elicit Basic.
• Searching and tracking papers, with alerts: Semantic Scholar.
• Questions over PDFs you already have: NotebookLM.
• Your own script or app that needs paper data: the Semantic Scholar API.
• Citation context (does a paper support or contradict a claim): a Scite trial, once.

Limits and the catch #

• Verify every citation. AI tools can summarize a paper wrongly or cite one that says something else; open the paper before you quote it, and read why models make things up.
• Your uploads are data. Check what a tool does with your sources before uploading unpublished work: why "free" chats may train on your data.
• Unpublished means unknown. Elicit's agent and NotebookLM's chat limits have no numbers; expect to be told "come back later".
• Limits move. The date beside each row is our check, and the date at the top of the page is the latest.