Clerk vs Auth.js vs Better Auth

Best for Teams that value shipping speed over control and cost — B2B SaaS especially, thanks to first-class Organizations, roles, and invitations.

Strengths

• Fastest path to production: drop in <SignIn/>, <UserButton/>, and <OrganizationSwitcher/> and you have polished, hosted UI with zero design work.
• Batteries fully included — MFA, passkeys, social login, email/SMS OTP, bot protection, and session management all managed for you, no cron jobs or token rotation to babysit.
• Best-in-class Next.js integration (middleware, App Router, server components) and genuinely good docs.
• B2B multi-tenancy (orgs, member roles, per-org metadata) is a real product, not a DIY exercise.

Watch out

• Your users live in Clerk's database. That's vendor lock-in on your most critical data, and migrating out later is real work.
• MAU-based pricing bites at scale — a free tier gets you started, but a growing consumer app can hit four-figure monthly bills, and premium features (SAML/enterprise SSO, extra orgs) push cost up fast.
• You bend to their data model and session semantics; deep customization means fighting the abstraction.

Best for The new default for anyone who wants full data ownership without hand-rolling every feature — TypeScript-first teams on Drizzle or Prisma who'd otherwise reach for Clerk but refuse the lock-in.

Strengths

• Own everything: auth tables live in your own Postgres/MySQL/SQLite via Drizzle, Prisma, or Kysely — no third party holds your users.
• Plugin system covers the hard stuff out of the box — 2FA, passkeys, magic links, organizations, multi-session, admin, rate limiting — so you get Clerk-like features while self-hosting.
• Genuinely framework-agnostic (Next.js, SvelteKit, Nuxt, TanStack, Expo, plain Node) with a clean, fully typed API.
• Free and open source, and it captured most of the self-hosted mindshare through 2025 for good reason: the DX is close to a managed service.

Watch out

• Still a young project — it hit 1.0 but the API and plugins have shifted before, so pin versions and read the changelog before upgrading.
• You host and maintain it: your database, your session cleanup, your security patches, your uptime.
• No prebuilt UI — you wire up your own forms and flows (the logic is handled, the pixels are on you).

Best for Projects already running it, or teams that just need proven OAuth/social login against dozens of providers and will build the rest themselves.

Strengths

• The most battle-tested option — enormous install base, huge provider catalog, and years of production mileage across the ecosystem.
• Self-hosted and free with adapters for Drizzle, Prisma, and most databases, so you keep your data.
• Flexible primitive: if you want a thin, un-opinionated session/OAuth layer to build on, it gets out of your way.
• Now framework-agnostic (SvelteKit, Express, others), not just Next.js.

Watch out

• The v5 / Auth.js transition dragged through a long beta with shifting docs — expect friction and stale tutorials when wiring it up.
• Thin on batteries: no built-in MFA, passkeys, or organizations — you build all of that yourself, which is exactly where Better Auth now wins.
• JWT-vs-database session behavior and callback config trip up almost everyone at least once.