The best alternatives to 1UpBlitz are ZEIT, Blitz.js, and Ship SaaS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Haggle — A CTA buyers want to click, when they aren't ready to demo
This starter kit includes all the integrations you need to build a SaaS app fast! You'll have a complete app with landing page, login, registration, and billing functionality ready in under a week. It's the easiest way to get started with Next.js and Supabase.