Lucia vs Better Auth: Which One Belongs in Your SvelteKit Stack?

Authentication is the thing every SvelteKit app needs and nobody wants to build from scratch. Two libraries have emerged as the community favorites: Lucia and Better Auth. Both are excellent. Both are actively maintained. And choosing between them isn’t as obvious as the Reddit threads suggest.

Here’s our take after integrating both into real SvelteKit projects.

Lucia: the minimalist’s choice

Lucia treats auth as a low-level primitive. It gives you session management, cookie handling, and adapter patterns for your database — then gets out of the way. There’s no built-in UI, no magic endpoints, no opinions about your login flow.

This is a feature, not a bug. If you want full control over every redirect, every error message, and every edge case, Lucia is the library that trusts you to handle it. The SvelteKit integration via hooks.server.ts is clean and well-documented.

Where Lucia shines:

• Minimal API surface — easy to understand the entire library
• Database-agnostic via adapters (Prisma, Drizzle, raw SQL)
• No vendor lock-in or opinionated patterns
• Battle-tested in production across hundreds of SvelteKit apps

Where Lucia asks more of you:

• OAuth providers require manual setup (each one is a separate integration)
• No built-in magic link or passwordless flow
• You write more code upfront for common patterns

Better Auth: the batteries-included approach

Better Auth takes the opposite stance. It ships with social login providers pre-configured, magic link support, email verification flows, and a plugin system for features like two-factor auth and organization management.

The DX is noticeably smoother for common cases. Adding Google OAuth is a few lines of config, not a custom implementation. The trade-off is abstraction — when something breaks or you need non-standard behavior, you’re debugging through more layers.

Where Better Auth shines:

• Fast setup for standard auth flows (OAuth, magic links, email/password)
• Built-in support for organizations and team management
• Plugin architecture for 2FA, passkeys, and session management
• Less boilerplate for the 80% case

Where Better Auth asks more of you:

• Larger dependency footprint
• Less transparent internals when debugging edge cases
• Fewer production hours in the wild compared to Lucia

Our recommendation

Pick Lucia if you’re building something with non-standard auth requirements, if you want to understand every line of your auth code, or if you’re the type of developer who prefers composing small tools over configuring large ones.

Pick Better Auth if you want to ship fast, your auth needs are conventional (email + social + maybe teams), and you’d rather configure than implement.

Both libraries work beautifully with SvelteKit. The starters in our directory that use each one are clearly tagged — filter by auth provider to see real implementations of both approaches.

Neither is the wrong choice. The wrong choice is spending three weeks building auth from scratch.