GitHub offers Free Trial, but Zepel does not.
GitHub is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Zepel is designed for Medium Business and Small Business.
Pricing for GitHub Starts at $4/User/Month whereas for Zepel Starts at $5/User/Month when Billed Yearly.
Some top alternatives to GitHub includes LiveCode, Codeanywhere, Visual Studio IDE, CodeinCloud, GitLive, Microsoft Azure, GitLab, CodeSee and Bitbucket.
Some top alternatives to Zepel includes ProdPad, ProductPlan, Jira, productboard, Productroad, Next Please, Trello, Asana, Teamwork and Height.