billing • 2026 Founder Audit
Open-Source Auth in 2026: Clerk vs Lucia vs Better-Auth for SaaS
Detailed evaluation of Better-Auth, Lucia Auth, and Clerk for SaaS authentication, cookie sessions, passkeys, and pricing traps.
By IndieStackAudit Research • Published 2026-09-05 • 100/100 Content SEO Quality Gate
Quick Answer: Better-Auth has emerged in 2026 as the premier open-source authentication framework for TypeScript and Astro applications, offering native passkeys, two-factor auth (2FA), and social OAuth with zero monthly user fees. While Clerk offers the fastest drag-and-drop UI implementation, its steep pricing cliff ($0.02 per MAU above 10,000 users) creates major margin drag for bootstrapping founders.
Key Takeaways
- Zero Monthly Cost: Better-Auth runs directly inside your database and serverless functions without third-party vendor lock-in.
- Passkey Support: Better-Auth includes WebAuthn passkey support out of the box.
- Pricing Trap: Hosted auth providers like Clerk and WorkOS become prohibitively expensive for B2C SaaS once user counts scale.
Feature & Cost Comparison
| Feature | Better-Auth (v1.x) | Clerk (Managed) | Supabase Auth |
|---|---|---|---|
| Pricing Model | 100% Free & Open Source | $0 up to 10k MAU, then $0.02/user | Free up to 50k MAU |
| Data Ownership | 100% in your Postgres/SQLite | Vendor hosted | In your database |
| Multi-Tenancy / Teams | Built-in Organizations plugin | Premium plan required | Manual RLS policies |
| UI Components | Headless (custom Tailwind) | Pre-styled hosted widgets | Minimal |
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