- Price
- Free up to 25k MAU; B2C Essentials from $35/month
- Free plan
- Yes
- Setup
- Needs a developer
- Up and running
- Basic login in an afternoon; SSO for a business customer takes a few more days of setup and testing.
What Auth0 is for
Auth0, owned by Okta, runs the login of your app for you: sign-up, passwords, Google sign-in, two-step verification and, for business customers, signing in with the company's own account (SSO). Its strength is the checklist big companies send before buying: SSO, audit logs and security certifications. You plug it into your app, and users log in on a page Auth0 hosts.
How it plugs into your product
- 1Create a tenant at auth0.com and register your app (web, mobile or API).
- 2Install the Auth0 SDK and send users to the hosted login page (Universal Login).
- 3On your server, check the token Auth0 returns before showing each user's data.
- 4Before launch, connect your own email provider and, if you want, a custom domain (card verification required).
Does it fit your idea?
It fits if
- A B2B SaaS selling to banks or large companies that will demand SSO and audit logs in the contract.
- A product that stays under 25k monthly active users and only needs basic login: the free plan covers it.
- A team that already uses Okta and wants the same vendor for customer login.
Look elsewhere if
- A consumer app that may need paid features early: a few thousand users already cost hundreds of dollars a month.
- A low-ticket B2B SaaS: B2B Essentials starts at $150/month for 500 users.
- You want ready-made sign-in components inside your own React pages instead of a redirect to a hosted page.
What people only find out after building
Read this before you build on it. Each item links to the official page that says so.
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.
Official source: auth0.comThe built-in email isn't for production: 10 emails a minute, no custom templates and every email comes from no-reply@auth0user.net.
Official source: auth0.comThe free plan keeps logs for only 1 day, allows 5 organizations and doesn't include the stronger MFA options.
Official source: auth0.comSeparate development and production environments only come with paid plans.
Official source: auth0.com
Price
Free up to 25k MAU; B2C Essentials from $35/month
Up to 25k monthly active users.
- Free tier
- 25k monthly active users
- Price for 10k monthly users
- Free tier, or $700/mo on B2C Essentials
- Self-host
- No
Checked on Oct 28, 2026 · official pricing
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).
Estimate from the official price. Check it before you decide.
At a glance
- Free plan: yes
- Open source: no
“Not stated” means the official site doesn’t say.
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