The best alternatives to Hipmatic are Betafy, BetaList, and BetaTesta. If these 3 options don't work for you, we've listed a few more alternatives below.
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Enterprise Ready Conference by WorkOS— For prod/eng leaders —speakers from OpenAI, Vanta, Canva
BetaList is a community of makers and early adopters showcasing their startups and exchanging feedback. It provides an overview of upcoming internet startups.