Sign-up needs no card, though enabling the included custom domain does. Auth0, listed on its own site as Auth0 by Okta, handles login, social connections, passwordless sign-in and API authorization for web and mobile apps. The Free plan costs $0, covers up to 25,000 monthly active users and needs no credit card to sign up, although adding a custom domain requires credit card verification. It includes one custom domain, five organizations, unlimited social connections, passwordless authentication, basic attack protection and community support, plus one enterprise connection, self-service SSO and SCIM. Paid plans start at $35 a month for Essentials and $240 for Professional. Reviews split by audience: G2 shows 4.3 from 286 reviews and Capterra 4.7 from 147, while Trustpilot shows 2.7 from 7. The recurring complaint, in G2's own comparison summary and in Reddit threads, is that the price climbs fast as user counts grow.
Free tier quotas
Monthly active users
Up to 25,000, no credit card needed to sign up
Custom domain
1 included, but credit card verification is required to enable it
Organizations
5
Social connections
Unlimited
Passwordless authentication
Included
Enterprise connection
1, with self-service SSO and SCIM (marked new on the pricing page)
Attack protection
Basic
Auth for MCP
Included
Support
Community support
Multi-factor authentication
Pro MFA factors are listed as not included on Free
Past 25,000 users
You must move to a paid plan and pick a user quota, from 1,000 up to 100,000 or more
Last sniffed Oct 1, 2026. Always confirm on the official pricing page.
👍 Good boy
+The Free plan covers 25,000 monthly active users with no card at signup, which is plenty for an early-stage product.
+Free includes passwordless login, unlimited social connections and five organizations, so you can test B2B-style tenancy without paying.
+One enterprise connection with self-service SSO and SCIM is listed on Free, which lets you try an enterprise login flow without a sales call.
+Auth for MCP is listed as included on Free, useful if you expose tools to AI agents.
+There is a lot of user feedback to read: G2 shows 4.3 from 286 reviews and Capterra shows 4.7 from 147.
+The Enterprise tier adds a 99.99% SLA, custom user and SSO tiers and a private deployment add-on, so a growing product can stay with one vendor.
+Paid plans let you pick a user count from 1,000 up to 100,000 or more, per the pricing FAQ, instead of forcing fixed bundles.
👎 Watch out
−Cost at scale is the loudest complaint. G2's Auth0 versus Stytch comparison page counts 26 all-time mentions of expensive and 19 of cost among Auth0's drawbacks.
−A poster in an older r/webdev thread said Auth0 raised its B2C Essentials plan from $0.023 to $0.07 per MAU, and an r/node poster compared that $0.07 with Amazon Cognito at $0.0055. Both are older figures, and the current pricing page shows plan prices rather than per-user rates.
−Trustpilot shows 2.7 from only 7 reviews. The sample is small, but it is the lowest rating Auth0 has on any site I checked.
−Pro MFA factors are listed as not included on Free. They start on Essentials at $35 a month.
−The free custom domain still needs credit card verification, even though signup itself does not.
−Dropping to Essentials or Professional means upgrading to the B2B plan to keep enterprise connections, self-service SSO and SCIM, per the pricing page footnote.
−Free support is community only. Standard support starts on Essentials.
The catch
Signup needs no card, but enabling the free custom domain requires credit card verification. Free also leaves out Pro MFA factors and gives community support only.
The real risk is the price curve. Paid plans pick a user quota from 1,000 up to 100,000 or more, and reviewers on G2 and Reddit keep returning to cost as user counts grow. Older Reddit threads quote per-MAU rates ($0.07 for B2C Essentials) that the current pricing page no longer shows, so run the pricing calculator with your own user count before you commit.
The Essentials and Professional footnote also says you must upgrade to B2B to keep enterprise connections, self-service SSO and SCIM. I could not confirm commercial-use terms for the Free plan from the pages I read. The page's own metadata calls it a free forever dev plan.
What’s included
✓Universal login with social connections
✓Passwordless authentication
✓Organizations for B2B tenancy
✓Enterprise SSO and SCIM (limited on Free)
✓Basic attack protection on Free, enhanced on Professional
✓Pro and Enterprise MFA factors on paid plans
✓Custom domain
✓Audit log streaming on Essentials
✓Auth for MCP
✓Machine-to-machine tokens as a paid add-on
Free tier value
Generosity
A
Estimated value
25,000 monthly active users with no card at signup
Feature parity
Essentials ($35 a month) adds Pro MFA, per-organization roles and audit log streaming.
Screenshots
Auth0 homepageAuth0 pricing page
Paid plans
Essentials, from $35 a month
Pro MFA factors, role-based access control per organization, 10 organizations, audit log streaming to Datadog, Splunk, AWS or Azure, separate production and development environments, standard support. The page shows 500 users in its default view, and paid plans let you choose a user quota.
Professional, from $240 a month
Everything in Essentials plus use of your existing user database for logins, Enterprise MFA, custom token exchange, enhanced attack protection and an M2M tokens add-on.
Enterprise, custom pricing
Custom user and SSO tiers, a 99.99% SLA, enterprise rate limits, enterprise administration and support, with advanced security and private deployment as add-ons.
Startup program
The pricing page links a startups program at auth0.com/startups. I did not read its terms.
Common questions
Is Auth0 free?
Yes. The Free plan costs $0, covers up to 25,000 monthly active users and needs no credit card to sign up.
What happens past 25,000 users?
You must choose a paid plan and a user quota, which ranges from 1,000 up to 100,000 or more.
Does the free plan include multi-factor authentication?
Pro MFA factors are listed as not included on Free and included from Essentials.
Does a custom domain need a card?
Yes. Signup is card-free, but the pricing page says credit card verification is required for custom domains.
Why do developers call it expensive?
G2 reviewers mention cost and expense often, and older Reddit threads cite a rise in the B2C Essentials per-MAU rate.
How well is it rated?
G2 shows 4.3 from 286 reviews, Capterra 4.7 from 147 and Trustpilot 2.7 from 7.
Change history
Checked October 22, 2026
Pricing page read. G2, Capterra and Trustpilot ratings taken from search excerpts. Reddit threads read as excerpts and treated as older. Commercial-use terms for Free not confirmed.
