The best alternatives to BlabRoulette are Hello, A Random Casey Neistat Vlog, and WeKiki. If these 3 options don't work for you, we've listed a few more alternatives below.
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.Tech Domains — Building a tech startup? Build it on a .tech domain. On the house for Product Hunt makers
Macarons is your virtual watercooler for casual conversations with colleagues you rarely meet on the hallway. Just add the Macarons app to a Slack channel and it will automatically pair off random members for having a casual chat over coffee.