The best alternatives to Simplicity Blocks are involve.me, FlowXO, and HipChat with Your Users. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
involve.me helps you turn online visitors into qualified leads with engaging funnels that combine quiz, form, survey, and calculator elements. You can start with 300+ templates or let AI build one for you. Everything’s fully customizable and personalizable in real-time based on people's answers. Share your funnel anywhere—on your site, in a popup, or as a standalone page—and connect it to your favourite tools. Built-in analytics and AI-powered reports help you keep improving.
We are building scalable promotions engine which businesses integrate with to provide a personalized shopping experience to customers. Our APIs are available here https://stack.promo/api/index.html and guide is here https://stack.promo/how-it-works.html