R Discovery vs ResearchRabbit

R Discovery

• Researchers who want a daily feed of new papers in their field
• Reading on a phone: the iOS and Android apps include audio versions of papers
• Readers who want papers translated into their own language
• Paperpal users who want search and writing tools on one subscription

ResearchRabbit

• Citation chasing from a few key papers at the start of a literature review
• Students and researchers who want a free tool with no cap on searches
• People who prefer to see a field as a map of connected papers and authors

R Discovery

• Free accounts get 3 AI Assistant uses and 3 Chat PDF uses a day, with 5 file uploads a month.
• Literature maps, content feeds, multiple projects and Zotero or Mendeley sync are listed for paid plans only.
• The site bills in local currencies, so prices vary by country. The US prices here are from the pricing page's own price data and agree with the US App Store listing.
• Refunds are limited to 30 days after purchase on annual plans and 7 days on monthly plans.

ResearchRabbit

• Free accounts can use up to 50 seed articles per search; RR+ raises that to 300.
• Advanced search filters, multiple projects and Signals badges are only in RR+.
• Recommendations rely on citation and authorship links; ResearchRabbit says its core algorithms do not use large language models.
• Articles without open-access metadata are not indexed, so some papers and citations can be missing.

R Discovery

Ask R Discovery

An AI assistant that answers research questions with references drawn from more than 300 million papers. Free accounts get 3 uses a day.

Chat PDF

Upload a paper, or pick one already on R Discovery, and ask questions about it. The free plan allows 3 uses a day and 5 file uploads a month.

Literature Review

Finds relevant papers and synthesizes findings, gaps and themes across them. The feature page says it is available only on a desktop or laptop.

Personalized feed and alerts

A feed of papers matched to chosen interests, with alerts for new publications in a field. Personalized recommendations and curated content feeds are part of Prime.

Audio papers and translation

Listen to papers read aloud and read them in more than 30 languages. Use is limited on the free plan and unlimited on Prime.

Library and reference manager sync

Save papers to reading lists. Prime syncs those lists to Zotero or Mendeley automatically and lets collaborators share them.

ResearchRabbit

Seed-based paper search

Start from one or more papers you already know and find similar, earlier and later work. Free accounts search from up to 50 seed articles and RR+ from up to 300.

Citation maps

Interactive maps show how papers and authors connect through citations and references, which helps in tracing how an idea developed.

Collections

Save papers to collections and subcollections, mark them with notes, stickers and colors, and share a collection with collaborators or through a public link.

Zotero and BibTeX

The Zotero Importer brings in papers saved in Zotero, and articles can be imported and exported as BibTeX files. Both are part of the free tier.

Advanced search filters

RR+ adds filters for keywords, publication date, journal quality, open access and retractions, plus separate projects for different papers.

Signals risk badges

In RR+, each article carries a Signals badge marking no major risks, caution, alert or unable to check. The full report needs a free Signals account.

R Discovery

• Free$0

  Standard recommendations, 3 AI Assistant uses a day, and 3 Chat PDF uses a day with 5 file uploads a month. No credit card required.

• Prime$69

  per year (shown as $6 a month, billed yearly); $12 billed monthly

  Unlimited AI Assistant, Chat PDF and Literature Review, literature maps and Zotero or Mendeley sync. Crossed-out prices: $119 a year and $19 a month.

• Paperpal Prime$144

  per year (shown as $12 a month, billed yearly); $25 billed monthly

  Everything in Prime plus Paperpal writing tools, plagiarism and reference checks, Mind the Graph illustrations and research skill courses.

ResearchRabbit

• Free$0

  Unlimited searches, library and collections, collection sharing, core search settings and up to 50 seed articles per search.

• ResearchRabbit+$10

  per month on the annual plan; $12.50 on the monthly plan

  Up to 300 seed articles, advanced search controls, multiple projects, Signals alerts and faster support responses.

• InstitutionCustom

  Everything in RR+ with volume discounts, LibKey library integration, management of thousands of users, usage statistics and dedicated support.

R Discovery

• Annual discount

  Yearly billing costs about half of monthly

  In the US price data, Prime is $69 a year against $12 a month, and Paperpal Prime is $144 a year against $25 a month. Both work out to about 52% less over a year.

ResearchRabbit

• Annual discount

  20% off with the annual plan

  RR+ is $10 a month on the annual plan against $12.50 on the monthly plan. The upgrade guide describes the annual option as 20% off.

• Other savings

  Country discounts in over 100 countries

  RR+ is priced by purchasing-power group. People in more than 100 eligible countries are shown a discount to apply at checkout; the US, UK and Canada pay the default price.