The best alternatives to ClaporSlap are Product Hunt, thingtesting, and BetaList. If these 3 options don't work for you, we've listed a few more alternatives below.
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Snowflake - BUILD— The Dev Conference for AI & Apps on Nov. 12-14
Founded in 2013 as a tiny side project, Product Hunt has become the place for makers and companies to launch their latest app, gadget, or physical products to the world. It's a global community of friendly folks sharing and discussing the latest in tech.
BetaList is a community of makers and early adopters showcasing their startups and exchanging feedback. It provides an overview of upcoming internet startups.