Next.js remains the pragmatic default for SaaS development in 2026. Next.js 16 ships Turbopack as the stable default bundler (cutting CI build times dramatically), React Server Components as the default rendering model, Server Actions for type-safe client-server mutations without API boilerplate, and explicit caching via the `use cache` directive. The post covers SaaS-specific patterns including multi-tenancy (path-based vs subdomain), auth library integrations (Better Auth, Clerk, Auth.js), and subscription billing flows with Stripe. Tradeoffs are addressed honestly: App Router learning curve, Vercel lock-in concerns (mitigated by OpenNext), slow production builds, and breaking changes between major versions. The recommendation is to use Next.js when you need the React ecosystem and hiring pool, and to avoid it if your team prefers Vue/Svelte or needs minimal bundle sizes. The post also promotes MakerKit, a Next.js SaaS starter kit.