Authentication is the part of every SaaS that's deceptively complex — sign-in, sign-up, password reset, MFA, social logins, magic links, sessions, JWT vs cookies, OAuth flows. Building it from scratch is 2–4 weeks of engineering most apps shouldn't reinvent. The 2026 landscape: Clerk and Supabase Auth dominate the modern stack, Auth0 still serves enterprise but is overpriced for indie, and Better Auth is the rising open-source alternative.
The 4 worth using
| Service |
Free tier |
Cheapest paid |
Best for |
| Clerk |
10k MAU |
$25/mo Pro |
DX-first, Next.js |
| Supabase Auth |
50k MAU (with Supabase) |
Bundled w/ $25/mo Pro |
Bundled with Supabase |
| Better Auth |
Open source, free |
Self-hosted |
Open source preference |
| Auth0 |
25k MAU |
$35+/mo Essentials |
Enterprise, legacy |
Best DX — Clerk
EDITOR'S PICK DX
Clerk
10,000 MAU free, $25/mo Pro adds custom domains + advanced features. Pre-built ``, ``, `` React components. Magic links, passwords, social login, MFA, organizations — all out of the box. Next.js middleware integration is best-in-class.
Visit Clerk →
When Clerk wins: any Next.js app where you want to ship auth in 30 minutes. The pre-built UI components save weeks.
When Clerk loses: pricing gets significant past ~10k MAU; budget-conscious projects look at Supabase Auth or Better Auth.
Best bundled — Supabase Auth
If you're already using Supabase for the database, Supabase Auth is included free up to 50k MAU. Same primitives (email/password, magic links, social, MFA), simpler integration with Supabase's RLS for row-level data security.
When this wins: Supabase-native stacks, indie projects on $25/mo Supabase Pro.
Best open-source — Better Auth
Better Auth (~2024 launch, rapidly maturing) is the best open-source auth library in 2026. Self-host, no SaaS dependency, similar DX to Clerk but you own everything.
When this wins: privacy-sensitive projects, projects scaling past free tiers, anyone preferring open source.
What's NOT worth your money
- Auth0 for indie SaaS — pricing scales aggressively past free tier
- Building auth from scratch for any commercial app — security implications are huge
- Multiple auth providers in the same app — pick one, commit
- Premium "passwordless" SaaS — all four above support magic links + WebAuthn natively
- Custom OAuth implementations when off-the-shelf services handle it
FAQ
Best for Next.js App Router?
Clerk has the deepest App Router integration. Supabase Auth + Auth.js (NextAuth) is also solid.
Can I use Clerk's free tier for production?
Yes, indefinitely if you stay under 10k MAU. Plenty of indie SaaS apps live entirely on free tier.
What about Firebase Auth?
Works fine, but Google's pricing model + ecosystem trends make it less attractive in 2026 vs Clerk or Supabase.
Should I do passwordless-only?
Magic links + social login covers most users; some still want passwords as an option. Best practice: support both.
How much does adding MFA cost?
Clerk and Supabase Auth include MFA in free tiers. Auth0 charges extra for MFA at lower tiers.
Is JWT or session cookies better?
Cookies for web apps (more secure, automatic). JWT for cross-domain APIs. All four services handle this correctly by default.
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