Scopus is Elsevier’s large multidisciplinary abstract and citation database, and it is the principal alternative to Clarivate’s Web of Science for tracking scholarly literature and its citation relationships. Both index peer-reviewed publications and the citations between them, but they differ in coverage philosophy, the headline metrics they publish, and how each is used in research assessment.
This article compares the two systems across the dimensions that matter for choosing and interpreting them, and offers a side-by-side table to summarise the differences.
Coverage and selection
Both databases are curated rather than exhaustive, applying editorial selection to the titles they index, but they make different trade-offs. Scopus is generally regarded as having a broader title list and wider coverage of disciplines, regions and document types, while Web of Science’s Core Collection is associated with a more tightly selective tradition rooted in the citation-index approach pioneered by Eugene Garfield. Neither covers the entire scholarly literature, and any analysis drawn from them is shaped by what each chooses to index. We unpack the Web of Science side in detail in our Web of Science explainer.
The headline metrics: CiteScore and the Impact Factor
Each platform has its own flagship journal-level metric. Scopus publishes CiteScore, a citation-per-document measure computed over a multi-year window from Scopus data. Web of Science, through the Journal Citation Reports, publishes the Journal Impact Factor, computed over a shorter window from Web of Science data. Because the two metrics use different source databases and calculation windows, a journal’s CiteScore and Impact Factor are not directly comparable, and a title may rank differently depending on which system you consult.
Both are journal-level indicators. Neither is a reliable measure of the quality of an individual article or researcher, and responsible-metrics frameworks consistently warn against that misuse.
Side-by-side comparison
| Dimension | Scopus | Web of Science |
|---|---|---|
| Provider | Elsevier | Clarivate |
| Type | Abstract & citation database | Citation-index platform (Core Collection) |
| Coverage style | Broad, multidisciplinary selection | Selective Core Collection |
| Headline journal metric | CiteScore | Journal Impact Factor (via JCR) |
| Metric source data | Scopus citations | Web of Science citations |
| Access | Subscription | Subscription |
Use in research assessment
Both databases are widely used in research evaluation, university rankings and bibliometric studies, and many institutions subscribe to both because their differing coverage produces different — and complementary — views of the same literature. A bibliometric analysis can yield materially different results depending on which database supplies the underlying data, so methodological transparency about the source is essential.
Crucially, citation databases describe attention and connectivity, not intrinsic merit. Movements such as responsible-metrics and narrative-CV approaches encourage assessors to use these tools as one input among many, alongside qualitative judgement and contributor-level information such as that captured by the CRediT contributor-roles taxonomy. Both systems also depend on persistent identifiers — especially the DOI — to disambiguate and link records accurately, and they sit within the broader landscape of research information systems.
Which should you use?
There is no universally correct answer. For the widest net across disciplines and document types, Scopus is often preferred; for the longer-established citation-index tradition and the Journal Impact Factor specifically, Web of Science is the source. For any serious analysis, using both and being explicit about coverage limitations is the most defensible approach. Definitions of the metrics named here are maintained in the CASRAI dictionary.
Frequently asked questions
Is Scopus bigger than Web of Science?
Scopus is generally described as having a broader title list and wider document coverage, while Web of Science’s Core Collection is more selective. The right database depends on whether breadth or selectivity matters more for your purpose.
Can I compare a CiteScore directly with an Impact Factor?
No. CiteScore and the Journal Impact Factor are computed from different source databases over different time windows, so the two numbers are not interchangeable and should not be compared head to head.
Do universities subscribe to both?
Many research institutions subscribe to both Scopus and Web of Science precisely because their differing coverage gives complementary perspectives on the literature and on journal performance.
Are these databases suitable for evaluating individual researchers?
Their journal-level metrics are not designed to assess individuals, and responsible-metrics guidance cautions strongly against using them that way. They are best treated as one input within a broader, qualitative assessment.
