The R Discovery Insider’s Guide
Everything we know about R Discovery in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
R Discovery
The Insider’s Guide
Paper discovery app with an AI assistant, PDF chat and audio
Every plan, grade, refund rule and rival among AI research tools, read from R Discovery’s own pages.
Made by Cactus Communications · checked Oct 5, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from R Discovery’s own pages, its app-store listings and our grades. Every fact in it is on R Discovery’s page too, where it is kept up to date. Checked Oct 5, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.8
GPA, above 21 of the 27 other AI research tools we grade
R Discovery is a literature search and reading app from Cactus Communications. It offers a personalized feed of papers, an AI assistant that answers questions with references from more than 300 million papers, PDF chat, a literature review workflow, and audio and translated versions of papers. It runs on the web, on iOS and Android and as a Chrome extension, and a second paid plan, Paperpal Prime, bundles it with Paperpal writing tools and Mind the Graph illustrations.
To get you started, here are 9 things to know about R Discovery, taken from its own pages and our grades.
The literature review tool only works on a desktop or laptop, there's no desktop app, and prices change by country.
- 1
Best for keeping up with new papers on your phone
R Discovery is a daily feed of new papers in your field, with an AI assistant, PDF chat and audio versions of papers on top.
- 2
Paid plans start at $5.75 a month when paid by the year
As its pricing page puts it: $69 per year, or $12 billed monthly (US prices).
- 3
There is a free plan
Standard recommendations, 3 AI Assistant uses a day, 3 Chat PDF uses a day with 5 file uploads a month, and limited audio and translation.
- 4
It runs on 3 platforms
Web, iOS and Android, with a browser extension too.
- 5
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.
- 6
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.
- 7
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.
- 8
A 2.8 GPA, above 21 of 27
That is against the other AI research tools we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
To replace R Discovery you would be making a library of papers and sources to search. That is not a weekend's work, with an AI app builder or without one.
R Discovery at a glance
- Pricing
- Free plan, from $69 per year, or $12 billed monthly (US prices)
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web, iOS, Android, Browser extension
- Made by
- Cactus Communications
- Category
- AI Research Tools
- Our grade
- 2.8 GPA, good
- Store rating
- 4.8 on the App Store, 921 ratings
The report card
Best for keeping up with new papers on your phone
R Discovery is a daily feed of new papers in your field, with an AI assistant, PDF chat and audio versions of papers on top. Staying free means 3 assistant questions and 3 PDF chats a day with 5 uploads a month, and literature maps and Zotero sync are Prime only, at $69 a year or $12 monthly. The literature review tool only works on a desktop or laptop, there's no desktop app, and prices change by country.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | B | Prime is $69 a year in the US, about $5.75 a month, which lands inside the cheapest quarter of a category that starts around $7.50 and sits nearer $10. An A here wants about $4.50, so it stops at B. It takes the caps off the AI Assistant, Chat PDF and Literature Review, and paying monthly is $12. |
| Free plan and trial | C | Free for good, no card needed. The day's allowance is 3 AI Assistant uses and 3 Chat PDF uses, with 5 file uploads a month. Fine for a look around. A real reading week runs out by Tuesday, and literature maps and Zotero sync are Prime only. |
| Features | B | A feed matched to your interests, an assistant answering with references from over 300 million papers, PDF chat, a literature review workflow, audio papers and translation into more than 30 languages. Finding and reading papers, covered end to end. Literature Review only runs on a desktop or laptop, though. |
| Ease of use | B | 4.8 on the App Store, but from about 920 ratings, and the top grade wants a thousand behind it. So B. You pick a few interests and the papers come to you. The catch is that Literature Review needs a desktop or laptop. |
| Platforms and integrations | B | Web, iPhone, Android and a Chrome extension, with Prime syncing your reading lists to Zotero or Mendeley and GetFTR, LibKey and Paperpal wired in as well. There's no desktop app, though, and our top mark wants one. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who R Discovery is for
- Fits if you want a daily feed of new papers in your field without going looking
- Works for people who'd rather listen to a paper on the bus than read it at a desk
Who it is not for
- Tight if you're staying free, with 3 AI Assistant uses and 3 Chat PDF uses a day and 5 uploads a month
- Skip it if you want literature maps or Zotero sync without paying, as both are Prime only
- Pricey if you pay monthly, at $12 against $69 for the whole year
- Watch out: Literature Review only runs on a desktop or laptop, and there's no desktop app
- Watch out: prices vary by country, and refunds close after 30 days on yearly plans and 7 days on monthly ones
Good to know
Good for
- 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
Worth knowing
- 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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$5.75
A month to start, paid by the year. There is a free plan too
R Discovery has a free plan. Paid plans start at $69 per year, or $12 billed monthly (US prices).
A real reading week runs out by Tuesday, and literature maps and Zotero sync are Prime only.
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.
The free plan
Standard recommendations, 3 AI Assistant uses a day, 3 Chat PDF uses a day with 5 file uploads a month, and limited audio and translation.
Read from discovery.researcher.life on Oct 5, 2026.
Ways to pay less
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.
Stated on discovery.researcher.life
What the app costs elsewhere
Each country’s App Store price for “Monthly”, against $11.99 in the United States, in dollars at the day’s rate. The four cheapest and the four dearest of 11.
| Country | Price there | In dollars | Against the US |
|---|---|---|---|
| Indonesia | Rp 169ribu | $9.45 | 21% less |
| Canada | $14.99 | $10.54 | 12% less |
| Mexico | $249.00 | $13.68 | 14% more |
| Australia | $19.99 | $13.96 | 16% more |
| India | ₹ 2,599 | $26.87 | 124% more |
| Brazil | R$ 149,90 | $29.95 | 150% more |
| South Africa | R499.99 | $30.24 | 152% more |
| Turkey | ₺1.649,99 | $33.55 | 180% more |
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
4
Places it runs: Web, iOS, Android and Browser extension
Paper discovery app with an AI assistant, PDF chat and audio. Here is what it does, as its own site describes it, and what it covers: chat assistant, AI search, research, citations.
Finding and reading papers, covered end to end.
- 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.
Where it runs
- Web
- iOS
- Android
- Browser extension
What it works with
- Zotero
- Mendeley
- ChatGPT
- GetFTR
- LibKey
- Paperpal
- Mind the Graph
R Discovery is made by Cactus Communications.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
21/27
Other AI research tools it is graded above
R Discovery's GPA of 2.8 is higher than 21 of the 27 other AI research tools we grade, and level with 4.
It stands best on value for money (B, above 18 of 27) and worst on free plan and trial (C, above 1).
Its paid plans start at $5.75 a month when paid by the year, against a middle price of $10 for the category: 0 of the 20 others that charge start lower.
On features, ease of use and platforms it scores 3.0 out of 4, and no tool on the category's chart scores higher without costing more.
Each grade against the category
Every bar is all 28 AI research tools we grade, cut by the letter each got. R Discovery’s own letter is outlined.
- BValue for moneyAbove 18 of 27
- CFree plan and trialAbove 1 of 27
- BFeaturesAbove 15 of 27
- BEase of useAbove 13 of 27
- BPlatforms and integrationsAbove 8 of 27
Price against what you get
Each dot is one of 25 AI research tools. Further left costs less; higher up scores better on features, ease of use and platforms. R Discovery is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace R Discovery you would be making a library of papers and sources to search. That is not a weekend's work, with an AI app builder or without one.
It is one of the better ones too: its GPA of 2.8 is higher than 21 of the 27 other AI research tools we grade. It costs $69 a year.
What you could not
- A library of papers and sources to search.
- A search engine with an AI model behind it.
- An AI model, which you can rent by the request but not make.
- Citation records for millions of papers.
- A real app for iOS and Android. Something home-made would be a web page.
- It plugs into other products, Zotero, Mendeley and ChatGPT among them.
- Sharing with other people, which means accounts and invitations.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. R Discovery’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Semantic Scholar, SciSpace, Consensus, ResearchRabbit and Paperguide
The 5 tools R Discovery is most often weighed against, with where each one differs from it.
- 3.2GPA
Semantic Scholar
Free
Free AI-powered search engine for scientific literature.
- Only R Discovery lists iOS and Android apps.
- R Discovery also covers chat assistant.
- 2.4GPA
SciSpace
Free plan · from $12/mo
AI research platform for literature review and reading papers.
- Only R Discovery lists an Android app.
- SciSpace also covers AI agents.
- 2.6GPA
Consensus
Free plan
AI search engine that answers questions from peer-reviewed papers.
- Only R Discovery lists an iOS app.
- Only R Discovery lists a browser extension.
- R Discovery also covers chat assistant.
- 2.2GPA
ResearchRabbit
Free plan · from $10/mo
Literature discovery tool that maps how papers connect.
- Only R Discovery lists iOS and Android apps.
- Only R Discovery lists a browser extension.
- R Discovery also covers chat assistant and AI search.
- 2.6GPA
Paperguide
Free plan · from $12/mo
AI research platform for literature and systematic reviews.
- Only R Discovery lists iOS and Android apps.
- Paperguide also covers AI agents and long-form writing.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is R Discovery free?
R Discovery has a free plan. Standard recommendations, 3 AI Assistant uses a day, 3 Chat PDF uses a day with 5 file uploads a month, and limited audio and translation.
How much does R Discovery cost?
R Discovery lists 3 plans. Free: $0.
What platforms does R Discovery work on?
R Discovery is available on Web, iOS and Android. It also has a browser extension.
Does R Discovery offer any discounts?
R Discovery publicly lists the following: Yearly billing costs about half of monthly.
How is R Discovery rated?
R Discovery's iPhone and iPad app averages 4.8 out of 5 from 921 ratings on the App Store in the United States, as read on Oct 5, 2026.
Does R Discovery have a Windows app?
No Windows app was listed when its pages were read on Oct 5, 2026. R Discovery is listed for Web, iOS and Android.
Does R Discovery have a macOS app?
No macOS app was listed when its pages were read on Oct 5, 2026. R Discovery is listed for Web, iOS and Android.
Is R Discovery open source?
R Discovery is not described as open source on its own site, as read on Oct 5, 2026.
What does R Discovery integrate with?
R Discovery's listing names Zotero, Mendeley, ChatGPT, GetFTR, LibKey, Paperpal and Mind the Graph.
Who makes R Discovery?
R Discovery is made by Cactus Communications.
What are the alternatives to R Discovery?
The closest alternatives to R Discovery in our directory are Semantic Scholar, SciSpace, Consensus, ResearchRabbit and Paperguide.
How does R Discovery compare with other AI research tools?
R Discovery's GPA of 2.8 is higher than 21 of the 27 other AI research tools we grade, and level with 4.
Is R Discovery good value for money?
ToolGPA grades R Discovery B for value for money. Its paid plans start at $5.75 a month when paid by the year, against a middle price of $10 for the category: 0 of the 20 others that charge start lower.
Could I make my own version of R Discovery?
To replace R Discovery you would be making a library of papers and sources to search.
Where this guide comes from
The prices, plans, platforms and features were read from R Discovery’s own pages on Oct 5, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from R Discovery's own pages on 5 October 2026, and its App Store rating. Also tested with a demo account on 2026-08-17.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Cactus Communications. Prices change, so check discovery.researcher.life before you buy.
- discovery.researcher.life/prime
- researcher.life/api/subscription/v1/get-pack-details?pack_machine_name=discovery-yearly¤cy=USD&user_country=us
- researcher.life/api/subscription/v1/get-pack-details?pack_machine_name=discovery-monthly¤cy=USD&user_country=us
- researcher.life/api/subscription/v1/get-pack-details?pack_machine_name=paperpal-prime¤cy=USD&user_country=us
- researcher.life/api/subscription/v1/get-pack-details?pack_machine_name=paperpal-prime-monthly¤cy=USD&user_country=us
- apps.apple.com/us/app/r-discovery-academic-research/id1508182175
- discovery.researcher.life
- discovery.researcher.life/chrome-extension
- discovery.researcher.life/literature-review
- discovery.researcher.life/ask-rdiscovery
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- R Discovery, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/r-discovery
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "R Discovery: The Insider's Guide", checked Oct 5, 2026. https://toolgpa.com/tools/r-discovery
Know someone choosing between AI research tools?
Send them this guide: toolgpa.com/tools/r-discovery/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded AI research tools after R Discovery, each with an Insider's Guide of its own.
- AI Research Tools Insider's GuideEvery one of the 28 AI research tools we grade, compared
- Ai2 Asta Insider's GuideAI research assistant for finding papers and analyzing data3.2 GPA
- Semantic Scholar Insider's GuideFree AI-powered search engine for scientific literature3.2 GPA
- ChatPDF Insider's GuideAsk questions about PDFs and get answers with citations2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what R Discovery’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. R Discovery is a trademark of its owner, and this guide is not made, paid for or approved by Cactus Communications. Prices and plans change: check discovery.researcher.life before you buy.