CORE vs Open Knowledge Maps (2026): which should you pick?
As of Nov 13, 2026, CORE grades higher than Open Knowledge Maps: 3.2 against 3.0 out of 4.0.
Checked Nov 13, 2026 · graded Nov 13, 2026 by ToolGPA
CORE grades higher on platforms. They get the same grade on value for money, the free plan, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Open Knowledge Maps
Free visual maps of a research topic from open scholarly sources
Which one is for you
Pick CORE if
- Fits if you want free full-text open access papers and no paywalls
- Works for developers who want a free research API
Look elsewhere if
- 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
Pick Open Knowledge Maps if
- Fits if you are new to a field and want its themes before you read anything
- Works for librarians running a discovery workshop on open sources
Look elsewhere if
- Skip it if you need every relevant paper, as each map holds only the top 100 results
- Not for you if you want papers ranked by quality, because it groups by metadata and does not rank
- Too light for a full literature search, since it never reads full texts
- Watch out: each map takes about 30 seconds because every query runs live
How we grade them
| 3.2GPACOREVery good | 3.0GPAOpen Knowledge MapsVery good | |
|---|---|---|
| Value for money | AFree search and a free API, from a not-for-profit, with no paid plan for individuals. | AFree outright, and the site shows no paid tier for individual users. Category tools start at $7.92 a month for the cheaper quarter. |
| Free plan and trial | ASearch and the API are free, with no registration, within rate limits that a normal person is unlikely to reach. | AEvery map is free with no plan to move up to, and the site shows no cap a normal person would hit. |
| Features | COpen 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. | CBuilds topic maps from BASE, PubMed and OpenAIRE records. It does that job fully, but it is a small job: the top 100 results only, metadata not full text. |
| Ease of use | BNo store rating on record, but you search and read open papers with nothing to set up. The API is for developers. | BNo store rating on record, but you type a topic and wait about 30 seconds for the map. Nothing to set up. |
| Platforms and integrations | BWeb and an API, with PubMed Central and Iris.ai. No desktop or phone app is listed. | CWeb only. BASE, PubMed, OpenAIRE and ORCID are where the records come from, and no API is listed. |
| Best for | searching open access research with a free API | a free visual map of an unfamiliar research topic |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: CORE and Open Knowledge Maps. How we grade
Price against what you get
CORE has no paid plan and scores 2.7 out of 4 on features, ease of use and platforms. Open Knowledge Maps has no paid plan and scores 2.3.
CORE scores higher for the same starting price. Of the other AI research tools on the chart, none scores higher than CORE for less, and none scores higher than Open Knowledge Maps for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- CORE also covers AI search.
- Open Knowledge Maps also covers mind mapping.
At a glance
| CORE | Open Knowledge Maps | |
|---|---|---|
| Pricing | Free | Free |
| Starts at | Free | Free |
| Free plan | Free search and a free API with no registration, within CORE's rate limits. | None |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Knowledge Media Institute, The Open University | Open Knowledge Maps |
| Price read from | core.ac.uk | openknowledgemaps.org |
| Checked | Nov 13, 2026 | Nov 13, 2026 |
Worth knowing
CORE
- 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.
Open Knowledge Maps
- Each map uses only the top 100 results, so important papers can be missing from it.
- Maps take around 30 seconds to build, because each query is processed live.
- Grouping uses metadata, not full text, and it does not rank papers by quality.
Key features
CORE
- 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.
Open Knowledge Maps
- Topic maps
- A search produces an interactive map of the top 100 results, grouped by topic similarity into labeled areas you can open.
- Open data sources
- Maps are built from BASE, PubMed and OpenAIRE records, with BASE covering more than 400 million outputs from over 11,000 sources.
- Open access emphasis
- Open access resources are highlighted, and most can be read inside the interface or are one click from the full text.
- Metadata-only grouping
- Clusters come from titles, abstracts, authors, journals and subject keywords, not from reading full texts; the site says it has no hallucinations.
- Custom services for organizations
- Institutions can embed Open Knowledge Maps' discovery tools in their own systems through a separate offering.
Plans
CORE
Free$0
Search and API access within published rate limits; registering organizations get a faster rate that is typically not free.
Open Knowledge Maps
Free$0
Create knowledge maps from the search page; the site shows no paid tier for individual users.
Ways to pay less
CORE
- 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.
Open Knowledge Maps
No public discounts listed.
Common questions
Which is cheaper, CORE or Open Knowledge Maps?
As of Nov 13, 2026, both CORE and Open Knowledge Maps are free to use.
Which has a free plan, CORE or Open Knowledge Maps?
As of Nov 13, 2026, both CORE and Open Knowledge Maps have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.