https://paperpile.com/g/academic-search-engines/

The top list of academic search engines

Content:

• 1. Google Scholar
• 2. BASE
• 3. CORE
• 4. Science.gov
• 5. Semantic Scholar
• 6. Baidu Scholar
• 7. RefSeek
• Get the most out of academic search engines
• Frequently Asked Questions about academic search engines
• Related Articles

Academic search engines have become the number one resource to turn to in order to find research papers and other scholarly sources. While classic academic databases like Web of Science and Scopus are locked behind paywalls, Google Scholar and others can be accessed free of charge. In order to help you get your research done fast, we have compiled the top list of free academic search engines.

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1. Google Scholar

Google Scholar is the clear number one when it comes to academic search engines. It's the power of Google searches applied to research papers and patents. It not only lets you find research papers for all academic disciplines for free but also often provides links to full-text PDF files.

• Coverage: approx. 200 million articles
• Abstracts: only a snippet of the abstract is available
• Related articles: ✔
• References: ✔
• Cited by: ✔
• Links to full text: ✔
• Export formats: APA, MLA, Chicago, Harvard, Vancouver, RIS, BibTeX

Google Scholar: fast, free and contains millions of research papers

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2. BASE

BASE is hosted at Bielefeld University in Germany. That is also where its name stems from (Bielefeld Academic Search Engine).

• Coverage: approx. 136 million articles (contains duplicates)
• Abstracts: ✔
• Related articles: ✘
• References: ✘
• Cited by: ✘
• Links to full text: ✔
• Export formats: RIS, BibTeX

BASE: combines the entries from thousands of institutional repositories in one place

3. CORE

CORE is an academic search engine dedicated to open-access research papers. For each search result, a link to the full-text PDF or full-text web page is provided.

• Coverage: approx. 136 million articles
• Abstracts: ✔
• Related articles: ✔
• References: ✘
• Cited by: ✘
• Links to full text: ✔ (all articles in CORE are open access)
• Export formats: BibTeX

CORE: the best is that all those 135+ million papers can be accessed for free

4. Science.gov

Science.gov is a fantastic resource as it bundles and offers free access to search results from more than 15 U.S. federal agencies. There is no need anymore to query all those resources separately!

• Coverage: approx. 200 million articles and reports
• Abstracts: ✔
• Related articles: ✘
• References: ✘
• Cited by: ✘
• Links to full text: ✔ (available for some databases)
• Export formats: APA, MLA, RIS, BibTeX (available for some databases)

Science.gov: one resource to access millions of papers and reports from several federal agencies

5. Semantic Scholar

Semantic Scholar is the new kid on the block. Its mission is to provide more relevant and impactful search results using AI-powered algorithms that find hidden connections and links between research topics.

• Coverage: approx. 40 million articles
• Abstracts: ✔
• Related articles: ✔
• References: ✔
• Cited by: ✔
• Links to full text: ✔
• Export formats: APA, MLA, Chicago, BibTeX

Semantic Scholar: AI-powered research tool for scientific literature

6. Baidu Scholar

Although Baidu Scholar's interface is in Chinese, its index contains research papers in English as well as Chinese.

• Coverage: no detailed statistics available, approx. 100 million articles
• Abstracts: only snippets of the abstract are available
• Related articles: ✔
• References: ✔
• Cited by: ✘
• Links to full text: ✔
• Export formats: APA, MLA, RIS, BibTeX

Baidu Scholar: the interface is in Chinese, but - hey - there is Google Translate!

7. RefSeek

RefSeek searches more than one billion documents from academic and organizational websites. Its clean interface makes it especially easy to use for students and new researchers.

• Coverage: no detailed statistics available, approx. 1 billion documents
• Abstracts: only snippets of the article are available
• Related articles: ✘
• References: ✘
• Cited by: ✘
• Links to full text: ✔
• Export formats: not available

Go for it.