|Features||Scopus||Web of Science|
|Number of journals||>20,000||>12,000|
|Content||Physical sciences, health sciences, life sciences, social sciences.||Sciences, social sciences, arts and humanities|
|Databases covered||100% Medline, Embase, and more||Science Citation Index, Social Sciences Citation Index, and Arts & Humanities Citation Index|
|Time period covered||Initially covered 1996-present. Now includes substantial content prior to 1996, with some back to 1823.||
Science component: 1900-.
Social science component: 1975-.
Arts & humanities component: 1975-.
|Controlled vocabulary||yes - IndexTerms field||no|
|Weaknesses||Social science coverage, esp. sociology and prior to 1966; but varies from discipline to discipline with perhaps unexpected strengths in certain areas||No controlled vocabulary|
Comparison of Scopus and Web of Science:
Review of Scopus:
Review of Web of Science: