The best alternatives to OnetapHELLO are Carrd, Gravity, and Postly. If these 3 options don't work for you, we've listed a few more alternatives below.
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Intercom for Startups— Advanced AI-powered features at a 90% discount
A free platform for building simple, fully responsive one-page sites for pretty much anything. With over 4000 upvotes, Carrd is one the most popular products of all time on Product Hunt.