Snowball Alternatives

Snowball is described as 'Lets you quickly find and filter through papers using the snowballing method. Start with a core collection of papers, and find more by going through their citations and references' and is a academic research tool in the education & reference category. There are more than 10 alternatives to Snowball for Web-based and iPhone. The best Snowball alternative is Google Scholar, which is free. Other great apps like Snowball are ResearchGate, Semantic Scholar, Curasynth and Connected Papers.