Best Free React.js Boilerplates

Cascade is a free, open-source SaaS starter kit based on the T3 stack (with Next.js + Prisma + PostgreSQL + TypeScript) that aims to give you a “ready-to-code business logic” foundation rather than a full-blown UI framework. Its core philosophy is minimal bloat. Once you clone the repo, provide environment variables and database config, you can have a working backend (auth, DB, basic flows) running locally in minutes. Cascade supports essential SaaS‑app plumbing such as authentication (via Auth.js / NextAuth + Prisma), database setup (PostgreSQL + Prisma), payments & billing (through Lemon Squeezy integration), background jobs (with Trigger.dev), error tracking (via Sentry), analytics (via self‑hostable or free‑plan friendly services like PostHog / Plausible), plus optional “business‑adjacent” pieces: a markdown-based blog via Contentlayer, email flows, server‑side rendering, and basic CI/CD / deployment setups.

BoxyHQ SaaS Starter Kit is an open‑source boilerplate built with Next.js intended to give developers a ready‑to‑use foundation for building enterprise‑style SaaS applications. The kit uses a modern, commonly used stack: Next.js + React + Prisma (for database ORM) + PostgreSQL (for persistent storage) + Tailwind CSS (for styling) + TypeScript (for type safety and maintainability).

Nextacular is a free, open‑source SaaS boilerplate built on Next.js (with React), using Prisma for database/ORM and styled with Tailwind CSS. It comes pre‑wired with core SaaS features: user authentication (magic‑link, OAuth/social logins via NextAuth.js), database integration (Prisma + a relational DB, e.g. PostgreSQL), multi‑tenant and workspace/team support, billing and subscription management via Stripe, customizable landing page and frontend scaffold, basic SEO setup, and email/communication support (for transactional emails, etc.). It also offers deployment‑friendly setup (with a one‑click deploy option for Vercel) and a modular, modern stack which can save significant time compared to building all infrastructure yourself. Nextacular is a good fit when you want to build a SaaS product that expects multiple organizations/teams, subscription billing, user authentication, and you prefer a clean, battle‑tested tech stack (Next.js + Prisma + Tailwind + Stripe). It’s especially attractive if you want to go from idea to a working prototype or MVP quickly without wiring all backend and billing/payment logic manually.

SaaS Starter Kit is a boilerplate/template for building full‑featured SaaS or web apps using Next.js + React + Tailwind CSS + modern tools/stack conventions. The template includes a complete backend + frontend foundation: user authentication (email, social OAuth, magic‑link), subscription payments and billing flows via Stripe or LemonSqueezy, subscription management (update/cancel/subscription portal), and multi‑tenancy support (organizations, team invites, roles & permissions) for apps that require team or org‑based access control. On the frontend side you get a pre‑made UI built with Tailwind + shadcn/ui, mobile/tablet responsiveness, dark‑mode support, and a set of ready‑to‑use pages: landing, pricing, blog, dashboard, admin panel plus built‑in support for email workflows (via Resend + react‑email), blog/content management, and basic marketing/ public‑facing site templates. The codebase is designed to be production‑ready: after setting environment variables you can deploy right away (optimized for deployment on services like Vercel). The project claims clean, modular architecture and full access to code so you own your code and can adapt it as needed. Because the kit is relatively feature‑rich (auth, payments, roles/permissions, multi‑tenant/org support, blog/marketing pages, email workflows, UI scaffolding, etc.), it may feel heavier than minimal templates, which for simple apps, prototypes or highly customized projects might introduce overhead.

This SAAS boilerplate is designed to streamline development using modern technologies like Nuxt3, Supabase, and Prisma. It emphasizes separation of concerns and avoiding vendor lock-in, opting for Prisma over Supabase API for database management, and TRPC over REST for efficient client-server communication. The template integrates Stripe for payment processing and supports OAuth via Supabase for authentication. Tailored for flexibility, it uses the Composition API across components and stores, ensuring a consistent approach. Deployment is simplified through Netlify, with detailed guidance on environment setup. This boilerplate serves as a robust starting point for building scalable SAAS applications.