ResearchRabbit is a literature discovery tool that starts from papers you already trust, called seeds, and recommends connected research through citations, authors and interactive maps. It searches more than 310 million academic papers and has a free plan that stays free: unlimited searches, collections and sharing, library uploads and up to 50 seed papers. RR+ costs $10 a month on the annual plan or $12.50 on the monthly plan at the default price for the US, UK and Canada, with discounts in more than 100 countries. It raises the seed limit to 300 and adds advanced search controls, multiple projects and Signals alerts. Institutions can buy licences with LibKey integration.
Reviewed by EdGrows·Updated Oct 6, 2026This analysis is based on documentation, public user reports, and vendor materials — not yet on our own hands-on testing. How we rate
Most search tools start from keywords. ResearchRabbit starts from papers. You give it one or more articles you already know are relevant, which it calls seeds, and it shows you what connects to them: work they cite, work that cites them, related papers and the authors behind them. Its homepage puts the idea simply: it analyzes papers you love and finds the research you've been missing.
It has been free since launch, and the core still is. In 2025 it added a paid tier, RR+, for people running very large reviews. The footer of the site now names Litmap Limited, the company behind Litmaps, as the copyright holder.
The free plan is generous enough for a typical thesis chapter. It includes unlimited searches across more than 310 million academic papers, unlimited collections, uploads from your reference library and shared collections for working with a supervisor or co-authors. ResearchRabbit says plainly that the free tier has everything needed to complete a literature review.
The limit that matters is seeds. Free accounts can use up to 50 seed papers in a search. That's plenty for exploring a focused question. A systematic review or a broad survey of a field can outgrow it, and that's the job RR+ is built for.
The annual plan selected on October 5, 2026. Switching to the monthly plan shows $12.50.
| Free | RR+ | Institution | |
|---|---|---|---|
| Price | $0 | $10 a month on the annual plan, $12.50 monthly | On request |
| Seed papers per search | Up to 50 | Up to 300 | Up to 300 |
| Search | Unlimited, core settings | Advanced search controls | Same as RR+ |
| Organization | Unlimited library and collections | Multiple projects, one per topic | Same as RR+ |
| Extras | Shared collections | Signals alerts, faster support | LibKey integration, usage statistics, user management, volume discounts |
The $10 figure is the default price for the US, UK, Canada and similar markets. In more than 100 other countries RR+ costs less, based on purchasing-power groups, and ResearchRabbit offers country discount codes. The subscription can be cancelled at any time and stays active until the paid period ends.
Signals are alerts that ResearchRabbit describes as protecting research integrity. Multiple projects keep separate reviews apart, which helps when one person runs several topics at once.
Each seed acts as a starting point. ResearchRabbit looks at its references, the papers that cite it and its co-authors, then suggests other papers you may have missed. Add the useful ones to your collection and the next round of suggestions shifts with them. The site describes recommendations that learn from how you explore, so a collection gets sharper the longer you work on it.
The other half is visual. Interactive maps show how papers, authors and topics connect, which makes it easier to spot a cluster of work you hadn't found, or a gap nobody has filled. A recent redesign, praised on the site by the librarian Aaron Tay, brought a cleaner step-by-step flow and a more configurable citation graph.
This approach has a blind spot worth knowing. Citation links favor older, well-cited papers, and a brand-new study with few citations surfaces later. Pair the maps with a conventional database search for the most recent work.
It does, but not in the chatbot sense. The recommendations come from algorithms that read citation patterns, co-authorship and your own choices. There's no assistant that writes summaries or answers questions in prose. That's a limitation if you want answers, and an advantage if your university's rules on generative AI make you cautious: what you get is a list of real papers to read and cite yourself.
Pay when you regularly hit the 50-seed ceiling, or when you need separate projects for several reviews at once. For a single dissertation, most students can stay on the free plan for its whole length.
For other jobs, other tools fit better. Undermind runs a deep AI search from a plain-language description of your topic. Elicit pulls data out of papers into tables, and Scite flags findings that later studies have disputed. Consensus gives a quick, cited answer when you only need the gist. The AI research tools guide lays out which stage each one handles.
Before subscribing, check the price shown for your country at checkout. In many countries it's lower than $10.
Yes. The Free Forever plan includes unlimited searches across more than 310 million papers, unlimited collections, sharing, library uploads and up to 50 seed papers, which ResearchRabbit says is enough to complete a literature review. RR+ is an optional paid tier for larger projects.
The default price, which applies in the US, UK, Canada and other countries, is $10 a month on the annual plan or $12.50 on the monthly plan. In more than 100 countries the price is lower, based on purchasing-power groups, and country discount codes are available.
It uses recommendation algorithms that analyze citations, references and co-authors, and that adapt to the papers you add and explore. It doesn't present a chatbot that writes answers or summaries; the output is a set of papers and maps for you to read.
Students can use the free plan without time limits, the same as anyone else. Universities can also buy institutional access, which includes RR+ features, LibKey integration with the library and usage statistics.
The site's footer now names Litmap Limited, the company behind the citation mapping tool Litmaps, as the copyright holder.
Cited AI search plus the new Computer agent: free plan, Pro at $20 or $200 a year, Max at $200, Computer credits, and the free Comet browser.
An academic search engine that answers from peer-reviewed papers. Basic search is free, Pro starts at $12 a month billed yearly, and students get up to 40% off.
A free chat app and one of the cheapest frontier-class APIs: V4.1-Flash with vision and open weights, from $0.15 per million input tokens off-peak.