Free AI tools / Best free AI research tools
Best free AI research tools
7 tools for finding sources and answering questions with citations that you can use without paying. Fully free tools are listed first, then free tiers, with the exact limits each vendor states. Free plans last verified 2026-10-24.
| Tool | Free plan | Free-plan limits | Paid entry plan | Checked | |
|---|---|---|---|---|---|
| Vane (formerly Perplexica) Private, self-hosted AI answering engine with cited sources, an open-source Perplexity alternative | Free | Open source (MIT), self-hosted; works with local models via Ollama or cloud providers you pay for | Free to self-host (open source, MIT) ✓ checked | source 2026-10-24 | Try Vane (formerly Perplexica) → |
| NotebookLM Studying your own documents, audio overviews | Free tier | 100 notebooks, 50 sources each; compute-based usage limit refreshing every 5 hours (fixed 50 chats/day replaced Sept 2026) | Included with Google AI Pro $19.99/mo ✓ checked | source 2026-10-22 | Try NotebookLM → |
| Perplexity Cited web answers and quick research | Free tier | Practically unlimited basic searches; 3 Pro Searches/day; 1 Research query/month | Pro $17/mo billed yearly ✓ checked | source 2026-10-22 | Try Perplexity → |
| Elicit Academic literature review | Free tier | Unlimited search across 138M+ papers, unlimited summaries and chat with papers; limited Research Agent and reports | Plus $12/mo billed yearly ✓ checked | source 2026-10-22 | Try Elicit → |
| Consensus Evidence from peer-reviewed studies | Free tier | Unlimited paper searches; 10 Pro messages, 3 Deep reviews and 10 Study Snapshots per month | Pro $20/mo ($12/mo billed yearly) ✓ verified | source 2026-10-22 | Try Consensus → |
| ChatGPT General-purpose chat, quick answers, images, custom GPTs | Free tier | Unlimited everyday text chats (abuse limits apply); limited image creation, voice and deep research; 3 file uploads/day | Plus $20/mo ✓ checked | source 2026-10-22 | Try ChatGPT → |
| Gemini Google Workspace users, research, generous free tier | Free tier | Flash-Lite model only, 32K-token context; compute-based limit that refreshes every 5 hours up to a weekly cap | Google AI Pro $19.99/mo ✓ checked | source 2026-10-22 | Try Gemini → |
Want it hosted or easier? Paid options
Self-hosting and free plans take setup time or have limits. If you would rather pay for a managed service, these fit the same jobs. Sponsored links are marked, and we show the free tier next to each price.
Disclosure: some links on this page are, or may become, affiliate links. If you buy through one we may earn a commission at no extra cost to you. It never changes which tools we list or how they rank. Details.
| Tool | Paid entry plan | Free tier | |
|---|---|---|---|
| Perplexity Cited web answers and quick research | Pro $17/mo billed yearly ✓ checked | Yes: Practically unlimited basic searches; 3 Pro Searches/day; 1 Research query/month | See Perplexity plans → |
| Elicit Academic literature review | Plus $12/mo billed yearly ✓ checked | Yes: Unlimited search across 138M+ papers, unlimited summaries and chat with papers; limited Research Agent and reports | See Elicit plans → |
| Consensus Evidence from peer-reviewed studies | Pro $20/mo ($12/mo billed yearly) ✓ verified | Yes: Unlimited paper searches; 10 Pro messages, 3 Deep reviews and 10 Study Snapshots per month | See Consensus plans → |
Tell us your project and we will pick the three best free tools for it.
Find free tools for my project“Free” means no paid plan exists for that product; “Free tier” means a free plan with the limits shown, as stated on the vendor page or help center on the check date. Free trials, one-time signup credits and plans that block downloads are not counted as free. Tools whose free plan we could not verify are left out. Limits change often; confirm on the vendor page. Some links are affiliate links (disclosure); they never change what we list.