The best alternatives to 1UpBlitz are Blitz.js, Ship SaaS, and Jumpsuit. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
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.