The CORE Insider’s Guide
Everything we know about CORE 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.
CORE
The Insider’s Guide
Open access research search backed by a free API
Every plan, grade, refund rule and rival among AI research tools, read from CORE’s own pages.
Made by Knowledge Media Institute, The Open University · checked Nov 13, 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 CORE’s own pages, its app-store listings and our grades. Every fact in it is on CORE’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
3.2
GPA, above 65 of the 69 other AI research tools we grade
CORE is a not-for-profit service from the Knowledge Media Institute at The Open University in the UK. It indexes research papers from repositories and journals and says it holds the largest collection of full-text open access papers. Searching is free, as is its API within rate limits, and organizations can pay for faster access.
To get you started, here are 8 things to know about CORE, taken from its own pages and our grades.
No store rating on record, but you search and read open papers with nothing to set up.
- 1
Best for searching open access research with a free API
CORE searches open access research papers and offers a free API.
- 2
It is free
CORE has no paid plan at all. Free search and a free API with no registration, within CORE's rate limits.
- 3
It runs on Web
Web.
- 4
Open access search
One search across metadata and full texts from repositories and journals, over 400 million records according to the About page.
- 5
API
Real-time machine access to metadata and full texts, usable for commercial purposes under the terms and documented with examples.
- 6
Recommender and Discovery
Listed under content discovery services, alongside FreshFinds; the Recommender suggests related papers across the repository network.
- 7
A 3.2 GPA, above 65 of 69
That is against the other AI research tools we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
CORE is free, so making your own would save you nothing.
CORE at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web
- Made by
- Knowledge Media Institute, The Open University
- Category
- AI Research Tools
- Our grade
- 3.2 GPA, very good
The report card
Best for searching open access research with a free API
CORE searches open access research papers and offers a free API. It covers open access content only, so paywalled papers are not there, and the free API is rate limited, with faster rates for organisations at no published price.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free search and a free API, from a not-for-profit, with no paid plan for individuals. |
| Free plan and trial | A | Search and the API are free, with no registration, within rate limits that a normal person is unlikely to reach. |
| Features | C | Open access search, an API, a recommender, datasets and repository tools. It holds open access papers only, and dataset access for text mining is a top membership benefit. |
| Ease of use | B | No store rating on record, but you search and read open papers with nothing to set up. The API is for developers. |
| Platforms and integrations | B | Web and an API, with PubMed Central and Iris.ai. No desktop or phone app is listed. |
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 CORE is for
- Fits if you want free full-text open access papers and no paywalls
- Works for developers who want a free research API
Who it is not for
- Skip it if you need paywalled papers, as it covers open access content only
- Tight if you run heavy API use, as free use is rate limited and faster rates are typically paid, with no price published
- Watch out: dataset access for text mining is a benefit of the top Sustaining membership
- Skip it if you want AI summaries or chat, as none are listed
Good to know
Good for
- Developers building tools on open access papers
- Researchers looking for a free full text
- Repository managers who want content indexed
Worth knowing
- Free API use is rate limited; faster rates for organizations are typically paid, with no price published.
- Dataset access for text mining is a benefit of the top Sustaining membership level.
- It covers open access content only, so paywalled papers are not available.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
CORE is free to use.
Free search and a free API, from a not-for-profit, with no paid plan for individuals.
Free
$0
Search and API access within published rate limits; registering organizations get a faster rate that is typically not free.
The free plan
Free search and a free API with no registration, within CORE's rate limits.
Read from core.ac.uk on Nov 13, 2026.
Ways to pay less
Other savings
30-day free trial for institutions
CORE says it offers a 30-day free trial of the API for Institution and Enterprise users, subject to eligibility checks at registration.
Stated on core.ac.uk
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Open access research search backed by a free API. Here is what it does, as its own site describes it, and what it covers: public API, AI search, research.
Open access search, an API, a recommender, datasets and repository tools.
- Open access search
- One search across metadata and full texts from repositories and journals, over 400 million records according to the About page.
- API
- Real-time machine access to metadata and full texts, usable for commercial purposes under the terms and documented with examples.
- Recommender and Discovery
- Listed under content discovery services, alongside FreshFinds; the Recommender suggests related papers across the repository network.
- Dataset and FastSync
- Listed under access to raw data: a dataset of the corpus for text and data mining, and a FastSync service, beyond the API.
- Repository tools
- A dashboard, OAI identifier resolver and FAIR certification help repositories manage how their content appears.
Where it runs
- Web
What it works with
- OAI Resolver
- PubMed Central
- Iris.ai
CORE is made by Knowledge Media Institute, The Open University.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
65/69
Other AI research tools it is graded above
CORE's GPA of 3.2 is higher than 65 of the 69 other AI research tools we grade, and level with 4.
It stands best on free plan and trial (A, above 61 of 69) and worst on features (C, above 1).
CORE has no paid plan.
On features, ease of use and platforms it scores 2.7 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 70 AI research tools we grade, cut by the letter each got. CORE’s own letter is outlined.
- AValue for moneyAbove 58 of 69
- AFree plan and trialAbove 61 of 69
- CFeaturesAbove 1 of 69
- BEase of useAbove 42 of 69
- BPlatforms and integrationsAbove 28 of 69
Price against what you get
Each dot is one of 59 AI research tools. Further left costs less; higher up scores better on features, ease of use and platforms. CORE 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
CORE is free, so making your own would save you nothing.
And it is not the kind of software a weekend replaces. It is one of the better ones too: its GPA of 3.2 is higher than 65 of the 69 other AI research tools we grade.
What you could not
- A library of papers and sources to search.
- A search engine with an AI model behind it.
- It plugs into other products, OAI Resolver, PubMed Central and Iris.ai among them, and has an API.
What this rests on. CORE’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, Google Scholar, Open Knowledge Maps and Exa
The 4 tools CORE 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 Semantic Scholar lists a browser extension.
- Semantic Scholar also covers citations.
- 3.0GPA
Google Scholar
Free
Free search engine for scholarly articles, books and theses.
- CORE also covers AI search.
- Google Scholar also covers citations and bookmarks.
- 3.0GPA
Open Knowledge Maps
Free
Free visual maps of a research topic from open scholarly sources.
- CORE also covers AI search.
- Open Knowledge Maps also covers mind mapping.
- 2.2GPA
Exa
Free plan
Web search API built for AI agents and applications.
- Exa also covers AI agents.
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 CORE free?
Yes. CORE is free to use.
How much does CORE cost?
CORE lists one plan. Free: $0.
What platforms does CORE work on?
CORE is available on Web.
Does CORE offer any discounts?
CORE publicly lists the following: 30-day free trial for institutions.
Does CORE have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. CORE is listed for Web.
Does CORE have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. CORE is listed for Web.
Is CORE open source?
CORE is not described as open source on its own site, as read on Nov 13, 2026.
Does CORE have an API?
Yes. CORE offers a public API, according to its own site.
What does CORE integrate with?
CORE's listing names OAI Resolver, PubMed Central and Iris.ai. A listing names up to eight integrations, so it may connect to more.
Who makes CORE?
CORE is made by Knowledge Media Institute, The Open University.
What are the alternatives to CORE?
The closest alternatives to CORE in our directory are Semantic Scholar, Google Scholar, Open Knowledge Maps and Exa.
How does CORE compare with other AI research tools?
CORE's GPA of 3.2 is higher than 65 of the 69 other AI research tools we grade, and level with 4.
Is CORE good value for money?
ToolGPA grades CORE A for value for money. CORE has no paid plan.
Could I make my own version of CORE?
CORE is free, so making your own would save you nothing. And it is not the kind of software a weekend replaces.
Where this guide comes from
The prices, plans, platforms and features were read from CORE’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from CORE's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
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 Knowledge Media Institute, The Open University. Prices change, so check core.ac.uk before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 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.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- CORE, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/core-research
- 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, "CORE: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/core-research
Know someone choosing between AI research tools?
Send them this guide: toolgpa.com/tools/core-research/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded AI research tools after CORE, each with an Insider's Guide of its own.
- AI Research Tools Insider's GuideEvery one of the 70 AI research tools we grade, compared
- Ai2 Asta Insider's GuideAI research assistant for finding papers and analyzing data3.2 GPA
- Brave Search Insider's GuidePrivate web search engine with its own index and AI answers3.2 GPA
- Resoomer Insider's GuideFree text summarizer and rewriting toolkit for documents3.2 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 CORE’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. CORE is a trademark of its owner, and this guide is not made, paid for or approved by Knowledge Media Institute, The Open University. Prices and plans change: check core.ac.uk before you buy.