Different databases have access to different resources and so one database on its own may not provide a comprehensive picture of Impact Factor/H-Index. As with any research, it’s a good idea to look in more than one source.
| Factor | Web of Science | Scopus | Google Scholar |
| Number of Journals | Least number of journals covered | More journals than WoS | Widest coverage of journals |
|
Coverage of subject areas |
Sciences and social sciences |
Sciences. More international journals than WoS |
Widest coverage of subjects |
|
Coverage of time |
1900 |
1966 |
Contains fewer older publications than WoS |
|
Author pages |
Individual author pages. |
Individual author pages. |
Individual author pages if author has created a Google Scholar Citation account. |
|
Content |
Academic content |
Academic content |
Includes some non-academic content as well as preprints |