React stack choices: Better Auth or Clerk, shadcn/ui or Mantine?

Start with the React framework boundary

React builds interfaces, but an application also needs routing, data access, deployment behavior, and authentication integration. React’s documentation recommends starting new applications with a framework. The options here are researched for Next.js App Router, the framework in our TypeScript SaaS stack.

This is not a claim that the tools only work with Next.js. Their integrations differ across frameworks. If you change the framework, use its corresponding official integration guide instead of carrying over Next.js route handlers or provider setup unchanged.

Better Auth or Clerk?

Better Auth is the application-owned path in this comparison. You configure authentication in your application and select a supported database adapter. In Next.js, its handler mounts in an App Router route. If Server Actions set cookies, the documented nextCookies plugin belongs last in the plugin list. Your team remains responsible for the surrounding infrastructure.

Clerk is the managed-identity path. Its Next.js SDK integrates a provider, sign-in experiences, and server-side session helpers. Follow the current guide for middleware or proxy setup, then protect the actual data operation. Your domain database still needs an ownership relationship to the authenticated identity.

Compare the flows you need—social sign-in, organization membership, account recovery, and session management—along with current provider pricing and migration requirements. Neither choice makes authorization automatic for every application query. Avoid running two identity systems for the same user flow unless you have a specific migration requirement.

Tailwind, shadcn/ui, or Mantine?

Tailwind CSS is a styling utility system, not an authentication library or a complete set of application screens. The shadcn/ui option adds component source that you can customize in your repository, with a Tailwind-based setup. This is useful when owning component implementations and matching a detailed design system are important to the team.

Mantine supplies a component library and theme system. Its Next.js setup includes stylesheets, MantineProvider, and ColorSchemeScript. Tailwind is not required for this choice. Evaluate whether maintaining editable component source or working within a library’s component API better matches your team’s workflow.

With either approach, verify keyboard interaction, field labels, focus states, contrast, and mobile layouts in the finished interface. Accessible primitives are a starting point, not a guarantee after customization. Keep interactive components at the framework’s appropriate client boundaries.

Combine the choices without mixing responsibilities

Two reasonable briefs are “Next.js + Better Auth + shadcn/ui” and “Next.js + Clerk + Mantine.” These describe ownership and UI preferences, not benchmark winners. Add your application database and deployment constraints to make either brief useful.

Use the stack starter to select exactly one authentication provider and one styling approach. Its generated prompt includes integration notes, source links, and a requirement to verify package compatibility. Provider quotas and framework setup evolve, so confirm current documentation before implementing rather than copying a version-specific snippet from an old comparison.

Choose a stack and copy the starter prompt

• Choose auth and styling in the TypeScript stack
• Choose auth and styling in the AI SaaS stack

Official sources

These are decision guides, not benchmark studies. The recommendations synthesize the linked documentation; verify current setup instructions and pricing before implementation.

• React framework guidance
• Better Auth Next.js guide
• Clerk Next.js guide
• Clerk pricing
• shadcn/ui Next.js setup
• Mantine Next.js setup

Continue planning your build

• What tech stack should you use for your app?
• How to build a SaaS app: choose the stack and first workflow

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