Scinapse is described as 'free search engine for academic papers. As of September 2018, it indexes more than 200 million articles from more than 40,000 journals' and is an website in the Education & Reference category. There are eight alternatives to Scinapse, not only websites but also apps for . The best alternative is Google Scholar, which is free. Other great sites and apps similar to Scinapse are Microsoft Academic Search (Free), Sparrho (Free), CiteSeerX (Free) and Scopus (Paid).
Microsoft Academic Search is an experimental research service developed by Microsoft Research to explore how scholars, scientists, students, and practitioners find academic content, researchers, institutions, and activities.
Elsevier’s Scopus, the largest abstract and citation database of peer-reviewed literature. Search and access research from the science, technology, medicine, social sciences and arts and humanities fields.
The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus. Discover, analyse, and map global innovation knowledge.
ArnetMiner (AMiner) is designed to search and perform data mining operations against academic publications on the Internet, using social network analysis to identify connections between researchers, conferences, and publications.
Thomson Reuters Web of KnowledgeSM is a research platform that gives you access to objective content and powerful tools to search, track, measure and collaborate in the sciences, social sciences, arts, and humanities.