Altmetric is a commercial organisation that monitors social media sites, science blogs, news sites and referencing tools for mentions of academic papers. Altmetric can provide a single score for a paper as a quantitative measure of the paper's impact.
The Altmetric Score is a weighted count of the different sources that mention the paper. It is weighted to reflect the relative importance of each type of source.
The Altmetric score is based on three factors:
- The number of times a paper has been mentioned
- Where the paper has been mentioned
- How often the author of each mention discusses scholarly articles
The Altmetric site includes a free bookmarklet and the code that is used by Altmetric is freely available for academic and non-commercial use, otherwise a commercial licence needs to be purchased.
Services using Altmetric to provide article-level metrics
A number of service providers automatically embed data from Altmetric for individual publication outputs. These providers include:
- Science Direct
- The Cochrane Library
- Wiley Online Library
- Highwire Press Journal
- Springerlink Journals
- Nature Journals
- Science Open
- BMJ Journals
- Royal Society of Chemistry scientific journals
- Biomed Central
Altmetric data embedded in these services will look similar to the example below:
The Altmetric bookmarklet
For sites that do not already use Altmetric, you can get a bookmarklet for your web browser (Chrome, Safari or Firefox) that will calculate an altmetric score for individual scholarly articles.
Add Altmetric scores into your own website
The quickest and free way to embed an Altmetric score in your own website is to embed an Altmetric badge. This can be done for any article or publication with a DOI (Digital Object Identifier), URI or PubMed ID. Instructions can be found on the Altmetric website.
There is a selection of badge styles to choose from:
Alternatively, organisations can pay to integrate Altmetric data with their own databases or repositories. More information about how to do this is available on the Altmetric website.