Auth0 vs Clerk vs Better Auth

Auth0, Clerk, Better Auth side by side: price, free tier, who each one fits and when to skip it.

Item	Auth0	Clerk	Better Auth
What it does	Okta's login platform with SSO, MFA and enterprise identity features.	Drop-in login and user management with ready-made sign-in screens for React and Next.js.	Open source TypeScript auth library that runs inside your app and keeps users in your own database.
Best for	A B2B SaaS selling to banks or large companies that will ask for SSO, audit logs and a security questionnaire.	A Next.js SaaS that needs Google login, user profiles and team accounts by tomorrow, without designing a single auth screen.	A founder who wants users in their own Postgres and no per-user bill as the SaaS grows.
Skip it if	You expect to outgrow the free tier soon, since 10k users on the paid B2C plan already cost $700 a month.	You sell B2B to lots of small companies, since organizations are a paid add-on billed per active organization.	You don't want to own security updates, email delivery and session bugs yourself.
Setup	Needs a developer. Basic login in an afternoon; SSO for a business customer takes a few more days of setup and testing.	Needs a developer. Working login in about an hour; going live takes up to 48 hours waiting for DNS.	Needs a developer. Email and Google login in a day for someone who codes; emails, rate limits and testing take a couple more days.
Price	Free up to 25k MAU; B2C Essentials from $35/month	Free; Pro $25/month ($20 billed yearly)	Free (you host it); optional dashboard from $20/month
What it costs in practice	A SaaS with 2,000 monthly active users fits in the free plan: $0. If it needs a paid feature, B2C Essentials bills by tier, so 2,000 users fall in the 2,500 tier: $175/month, or $1,925 a year paid upfront (estimate, in dollars).	A SaaS with 2,000 users returning each month stays on the free plan: $0. If you want MFA and your own branding, Pro is $25/month ($20 billed yearly). With 150 active customer teams, add 50 × $1 = $50, about $75/month in total (estimate).	With 2,000 monthly active users, the library itself is $0; you pay only for the server and database you already run. If you want their hosted dashboard with email sending, Pro is $20/month plus $0.001 per email: about 4,000 emails a month adds $4, around $24/month (estimate).
Free plan	Up to 25k monthly active users.	Up to 50k monthly retained users per app, no card required.	The library is free and open source (MIT) and you host it; the optional dashboard has a free plan.
Free tier	25k monthly active users	50k retained users/month	Unlimited (runs on your server)
Price for 10k monthly users	Free tier, or $700/mo on B2C Essentials	Free (within the 50k free tier)	Free, you only pay your own hosting
Self-host	No	No	Yes, it always runs in your app
Open source	No: no	No: no	Yes: yes
Before you build	Leaving the free plan is a big jump: B2C Essentials is $70/month for 1,000 users and $175 for 2,500; B2B Essentials is $300 for 1,000. The built-in email isn't for production: 10 emails a minute, no custom templates and every email comes from no-reply@auth0user.net. The free plan keeps logs for only 1 day, allows 5 organizations and doesn't include the stronger MFA options. Separate development and production environments only come with paid plans.	Production needs a domain you own: a free host address like yourapp.vercel.app is refused, since Clerk needs DNS records on it. The free plan has no MFA, no passkeys, no SMS codes and keeps the Clerk badge; those start on Pro at $25/month. On the free plan, sessions are fixed at 7 days, so users have to log in again every week; changing that requires Pro. Organizations are billed separately: 100 active ones are included, then $1 each per month, and custom roles are a $100/month add-on.	It needs a server and a database: the handler has to run on a backend route, and users are stored in tables you manage. It doesn't send email: you write the function that sends verification and password reset emails through your own provider. Rate limiting is off in development and kept in memory by default, which doesn't hold up on serverless hosts; you have to move it to a database. Security fixes are yours to apply: in 2026 the project published several critical and high advisories, including account takeover bugs.
Price checked	Checked on Oct 28, 2026 · official pricing	Checked on Oct 28, 2026 · official pricing	Checked on Oct 28, 2026 · official pricing

Prices are read from each official pricing page on the date shown and can change. Always confirm before signing up.

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