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The best open-source, self-hostable Retool alternatives for a Next.js SaaS in 2026: Appsmith, ToolJet, Budibase, Refine, and Windmill, compared by license, cost, and whether they run as a separate server or live in your app.
Most people searching for a Node.js workflow engine are holding two problems at once. We split the shelf along that seam: job queues (BullMQ, pg-boss) on one side, workflow engines with durable execution (Hatchet, Trigger.dev, Temporal, Inngest) on the other, and the test that tells you which one you need.
Appsmith, ToolJet, and Budibase are the open-source answer to Retool. We compare the three self-hostable internal tools builders for a Next.js SaaS in 2026, split honestly by license and by weight.
React-Admin is the most popular open-source React admin framework, but is it the right admin panel for a Next.js SaaS in 2026? A ShipGarden curator's hands-on take on the free MIT core, the Enterprise Edition paywall, and where Refine or AdminJS fit better.
Serverless Postgres is four different bets in 2026, not one. A ShipGarden curator's source-checked guide to Neon, Supabase, Xata, and Nile for a Next.js SaaS: branching, real pricing, multi-tenancy, and where each one loses.
Medusa, Saleor, and Vendure for open-source headless commerce on Next.js in 2026: language, license, real managed pricing, honest 'where it loses', and how to pick.
Mastra, LangChain.js, and LlamaIndex.TS for building AI agents in TypeScript, 2026: stars, license, which is still maintained, and how to choose.
Inngest, Trigger.dev, and BullMQ for Next.js background jobs in 2026: where each runs, real pricing, honest 'where it loses', and how to pick.
UploadThing, Amazon S3, and Cloudflare R2 compared for Next.js file uploads in 2026: the egress-driven cost math, the DX tradeoffs, and which one to pick.
Resend, SendGrid, Postmark and Amazon SES compared on real 2026 pricing, free tiers, deliverability, and the open-source react-email layer, with a decision guide for Next.js SaaS builders.
Stripe acquired Lemon Squeezy and now sells its own merchant of record, so the real 2026 question is whether you rent that role to Paddle, Polar, or Stripe, or stay a raw Stripe processor. Real fees, honest tradeoffs, and which your Next.js SaaS should pick.
Neon or Supabase for your Next.js SaaS starter in 2026? A curator's honest, source-checked head-to-head: it is not two databases, it is a database vs a whole backend. Branching, scale-to-zero, the pricing that changed, and where each one loses.
