Unpaywall is a free browser extension that finds full-text versions of research papers across the web.
Best Kopernio Alternatives ranked by AI · updated May 2025
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Kopernio helps you access research articles and organize your references. Works seamlessly with your browser.
Price: Free basic version, Paid premium
Top 6 Kopernio alternatives
ArticleFinder is a scholarly document-delivery service for researchers, librarians, and organizations seeking journal articles and other academic documents. It helps locate hard-to-find...
Pros
- Can obtain articles that are difficult to access through ordinary web search
- Supports document delivery for libraries and research teams
- Useful for locating older or obscure scholarly publications
Cons
- Access may require payment for individual documents
- Less useful than open-access indexes for freely available papers
- Not designed primarily for citation analysis or research-network discovery
Pay per document; institutional pricing available
Open Access Button was a service for researchers that found legal, freely accessible copies of scholarly articles and helped request papers from...
Pros
- Focused specifically on locating legal open-access copies
- Could request articles directly from authors when no free copy was found
- Supported DOI, title, and browser-based searches
Cons
- Retired and no longer available for active use
- Coverage depended on repository deposits and author responses
- Had less comprehensive scholarly discovery than Google Scholar or Semantic Scholar
RemovePaywall is an online service that helps readers access articles obscured by publisher paywalls. It is aimed at general web users who...
Pros
- Quick URL-based workflow for individual articles
- Requires less setup than browser extensions
- Useful for readers who do not need a full archive or research database
Cons
- Coverage depends on whether an accessible copy can be found
- Less reliable than established web archives for older pages
- May not work with metered, authenticated, or heavily protected publishers
PaywallBuster is an online service and browser-based tool for accessing articles blocked by common website paywalls. It is aimed at readers who...
Pros
- Works through a browser without requiring a full desktop application
- Faster for one-off article checks than installing an extension
- Targets common metered and registration-based paywalls
Cons
- Coverage is less predictable than a maintained browser extension
- May not work against subscription, login, or dynamically rendered paywalls
- Raises legal and publisher-terms concerns depending on the site and jurisdiction
6
Sci-Hub is a website that provides free access to research papers.
Pros
- Free access to research papers
- Easy to use interface
Cons
- Legal issues with publishers
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