Finding the possibilities
Shortlist · checked Oct 4, 2026
Best AI research assistants
Research tools differ in whether they cite sources, search the open web or only papers, and how many deep-research runs a plan includes.
- Lowest listed start
- Humata · $9.99/mo
- With a free plan
- 8 of 10
- With API access
- 8 of 10
What to compare
- Source coverage: web, academic papers or your own documents
- Citations you can verify
- Limits on deep-research runs per plan
- Free tier and price of the first paid plan
- 01
Perplexity
Perplexity is an AI answer engine that searches the web and responds with cited answers. The Pro subscription raises usage limits and adds premium data sources, model selection, and its Computer agent feature.
Best for: Researchers and professionals wanting cited, web-grounded answers with optional higher-limit paid plans.
- 02
This is a shortlist, not a ranking by quality. Tools are ordered by fit for the task, and every price, free-tier and API statement comes from the vendor's own pages on the date shown. Where a figure could not be confirmed it is marked as such.
AI research assistants: common questions
What is the best free AI research assistant?
Perplexity, Elicit, Consensus, ChatGPT, Claude have an ongoing free plan in this list. Free plans change and often cap usage, so check the vendor before relying on one.
What is the cheapest paid option?
Humata has the lowest listed starting price in this list at $9.99/mo per month. Some prices are quoted for annual billing; each tool's page shows the billing basis.
Which of these have an API?
Perplexity, Elicit, Consensus, Scite, ChatGPT, Claude mention API or developer access. Check each vendor for API pricing, which is usually billed separately.
