Help
Frequently asked questions
What people usually ask about this ranking.
Where does the data come from?
All data comes from OpenAlex, the world’s largest open catalog of scientific literature, published under a CC0 license. We do not enter data manually.
What is the h-index?
An h-index of N means a researcher has N publications with at least N citations each. It combines productivity and impact in a single number. It favors high-citation fields and long careers, so it is an impact indicator, not a measure of individual quality.
Why is a researcher or university missing?
We only list those with an h-index above 19 whose primary affiliation is in the country. Foreign collaborators with occasional ties are excluded. In countries with many authors, we include the 3,000 with the highest h-index.
How is an error corrected?
The primary source is OpenAlex: corrections can be requested there and are later reflected here. You can also write to us from the contact page so we can review it.
Is this an official ranking?
No. It is a non-profit, unofficial science communication project. It should not be used as the sole criterion to evaluate people or institutions.
How often is it updated?
It is updated periodically from OpenAlex data. The date of the last update appears in the footer of every page.
Can I use or download the data?
Yes. The data comes from OpenAlex under a CC0 license. You can explore and download it from the search tool of each ranking.
Have another question? See the methodology or write to us from the contact page.