Clerk vs Auth0 (2026): Which Is Better for Developers?

Pick Clerk Pro at $25/mo when a React or Next.js app needs authenticator MFA inside 50,000 retained users and three dashboard seats are enough. Pick Auth0 Free while you stay under 25,000 monthly active users and can live without that second factor. The moment you need it, Auth0 B2C Essentials at 10,000 users is $700/mo.

Prices below were checked on 18 October 2026 on Clerk's pricing page and Auth0's pricing page. Clerk bills a monthly retained user, someone who returns at least a day after signup, so a one-time visitor does not raise the bill. Auth0 bills a monthly active user, any non-employee who authenticated that month, so that same signup costs money if they logged in.

Toolradar data: in the 16 October 2026 snapshot of 103 identity and access tools, Auth0 is listed as an alternative to 54 other tools, 2nd in the category, while Clerk is listed against 20 and sits 9th. Buyers who shortlist one of these two usually meet the other, which is why this head to head exists. The full table is on Toolradar's identity and access statistics.

At a glance

Product	Best for	Starting price	Standout
Clerk	A React or Next.js app that wants login components in the layout	$25/mo on Pro, with 50,000 retained users included	Authenticator MFA, passkeys, and unlimited social logins start on Pro
Auth0	A hosted login, passkeys before you pay, or a custom user database	$35/mo on B2C Essentials, at 500 monthly active users	Free covers 25,000 users, passkeys, and one enterprise connection

Customer authentication, for a developer, is the login screen, the user record, and the check that a session may call your API. Both products are that layer, so the choice is where the screen lives and which free-plan wall you hit first. Start with Clerk when the buttons belong in a React or Next.js layout. Start with Auth0 when you want one hosted page, passkeys before any invoice, or a user database you still own.

The four-way bill at much larger volumes, including Supabase Auth and Firebase, is Authentication pricing compared. This page is the choice between these two products. Each one also has its own full write-up: the Clerk review and the Auth0 review.

Where does the login screen live, in the app or on a redirect?

Clerk's Next.js quickstart puts SignInButton, SignUpButton, and UserButton in the layout, and the pricing page includes prebuilt sign-up, sign-in, and profile UI on every plan, Hobby included. You style them next to the rest of the app, and a production deploy is what ships a login change, so a copy tweak waits on a release.

Auth0's Universal Login is a page on Auth0's authorization server. The app redirects there, and the dashboard can change that page without a frontend release. Auth0 says active development is on that hosted experience rather than Classic Login, which no longer receives updates, so a new app should not start on the older page. A custom domain for the hosted pages is on the free plan, and verifying it requires a credit card, so Free stops being card-free once login has to use your hostname.

Clerk wins the week you want the buttons in the same layout as a Next.js app. Auth0 wins when login should stay on one hosted page shared across web, mobile, and a second product, with passwordless and unlimited social connections already on the free plan.

Hobby still shows "Secured by Clerk" on those components. Removing that line is a Pro feature, so a commercial app that cannot wear the badge is on the paid plan even when the user count is small.

How much does each plan cost once you leave free?

Clerk's fee is a flat monthly price until you pass the included retained users, so people who never return do not raise it. Auth0's fee is a step on a user slider, and B2C and B2B are different ladders, so one headcount can produce two bills. Where an Auth0 row lists two monthly prices, the first is the entry step and the second is the step the MFA scenario below uses. The slider tops out at a 30,000+ step, where only B2C Essentials still prints a price and the other paid cards say to get in touch, so Enterprise on both products is a quote.

Plan	What you pay	What a developer should read
Clerk Hobby	Free	50,000 retained users per app, 3 dashboard seats, 3 social connections, no MFA, no passkeys, sessions fixed at 7 days, logs kept 1 day
Clerk Pro	$25/mo, or $20/mo billed annually	The same retained-user allowance, then $0.02 per user per month through 100,000. MFA, passkeys, unlimited social logins, branding removed, one SSO connection. Same dashboard seat cap as Hobby
Clerk Business	$300/mo, or $250/mo billed annually	10 dashboard seats, a SOC 2 report, admin logs, and 30-day application logs. The user meter matches Pro
Clerk Enterprise	Custom quote	99.99% uptime SLA, a HIPAA BAA, and migration help
Auth0 Free	Free, no card	25,000 monthly active users, passkeys, unlimited social connections, 5 organizations, one enterprise connection, self-service SSO, and SCIM. No Pro MFA. 3 admins, 1 tenant, logs kept 1 day
Auth0 B2C Essentials	$35/mo at 500 users, $700/mo at 10,000	Pro MFA (OTP and Duo), 10 organizations, separate dev and prod tenants, unlimited admins, logs kept 5 days. Enterprise connections, self-service SSO, and SCIM are not on this ladder
Auth0 B2C Professional	$240/mo, then $1,600/mo (same user steps as B2C Essentials)	Your own user database, enterprise MFA (phone, email, WebAuthn, Guardian push), stronger attack protection. At 30,000 users the card says to get in touch
Auth0 B2B Essentials	$150/mo, then $2,100/mo (same user steps as B2C Essentials)	Unlimited organizations, 3 enterprise SSO connections, Pro MFA, dev and prod tenants. Enterprise MFA is an add-on
Auth0 B2B Professional	$800/mo at the low step (same first step as B2C Essentials)	Enterprise MFA included, a custom user database, and a security center. At 20,000 users the card says to get in touch
Auth0 Enterprise	Custom quote	99.99% uptime SLA. HIPAA is listed as an add-on, not as part of the self-serve grid

Auth0's yearly toggle labels the discount as one month free. At the 500-user step, B2C Essentials billed yearly is $385, which is 11 months of the monthly rate rather than 12. Every other step on the toggle follows the same 11-month pattern, so the annual saving is one month's fee at the step you actually buy, not a percentage off a larger bill.

A Clerk user counts only after they come back at least 24 hours later, so a launch day of people who try the app once does not move the meter. Pass the included cap, or 100 retained organizations, and Clerk gives one month of grace before the app must be on a higher plan. Auth0's free plan ends at its user cap with no separate grace line on the pricing page, and the FAQ says you pick a paid tier as soon as you pass it.

What do 10,000 users cost once MFA is required?

Take a B2C app at that higher step, on monthly billing, with authenticator MFA turned on. Treat Clerk retained users and Auth0 monthly active users as the scenario, and remember they are not the same people.

Clerk Pro covers that retained-user count inside the allowance, so the bill is the platform fee. Auth0 Free includes passkeys, but Pro MFA is a paid feature, so the same second factor is B2C Essentials at $700/mo. The gap is $675 a month, and across twelve monthly invoices that gap is $8,100, which is our multiplication of the two published monthly prices, not a number either vendor prints.

If passkeys are the second factor you actually wanted, Auth0 Free already has them and Clerk does not until Pro. In that case the Auth0 bill stays at zero until the free user cap, and Clerk is the one that has to leave Hobby.

Clerk charges $0.01 per SMS in the US and Canada, with international messages at a market rate, and SMS codes are not on Hobby. An authenticator app on Pro does not send those texts, which makes it the cheaper second factor when users will install one. Auth0's enterprise MFA factors, which include phone, sit on B2C Professional or on a B2B add-on, not on Essentials, so a text code costs a higher plan than OTP or Duo.

Which free-plan wall shows up first for a small team?

A fourth person in the dashboard changes the Clerk plan before the user count does. Hobby and Pro both stop at three seats, and Business, the first plan with 10 seats, charges $20/mo for each seat past that allotment. Auth0 Free also stops at three admins, then Essentials lifts that cap to unlimited admins. A four-person team that needs the dashboard is on Clerk Business or on an Auth0 paid plan.

Hobby allows three social connections, and Pro removes the cap, so Google, GitHub, and a third provider stay inside Hobby. A fourth provider is a Clerk upgrade, not an Auth0 upgrade, because Free includes unlimited social connections, subject to the system limits the pricing page notes.

Hobby locks the session lifetime at seven days, and Pro lets you set it from five minutes to 10 years, which is the range an admin tool needs and a consumer app wants. Auth0 lists long-lived sessions on Enterprise only, so a self-serve tenant does not get that knob, and a short admin session forces Clerk Pro or an Auth0 contract.

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How do customer organizations and SSO get billed on each plan?

Clerk includes organizations on every plan: 100 retained organizations per app, up to 20 members each, and Admin and Member roles. A retained organization needs at least two members, and one of them has to be a retained user, so an empty tenant does not bill. The enhanced B2B add-on is $100/mo and adds unlimited members, custom roles, and a way to attach enterprise connections to organizations.

SSO itself is not on Hobby, so a customer identity provider starts on Pro, which includes one connection, and each further connection is $75/mo. Directory sync is included once on paid plans, and extra directory-sync connections start billing on 1 January 2027 at that same rate.

Auth0 Free includes five organizations, one enterprise connection, self-service SSO, and SCIM. The paid B2C cards tell you to move to B2B if you still want those features, so buying Essentials for MFA can drop the enterprise connection you had on Free. B2B Essentials, at the entry step, includes unlimited organizations and the connection bundle in the table, plus Pro MFA. At the higher step that same B2B plan is the $2,100 price in the table.

For three customer SSO connections inside the retained-user allowance, Clerk Pro on monthly billing plus two extra connections is $175/mo, our sum of the monthly Pro fee and two published connection prices. That sum does not include the B2B add-on, so custom roles are extra. Auth0 B2B Essentials includes that bundle in the plan price, the smaller bill at the low step and the larger one at the higher step. Buy the Auth0 ladder when each customer brings a SAML provider and the user count is still on the low steps. Stay with Clerk's per-connection rate when the user count would already have pushed B2B Essentials up the slider.

What do logs, the uptime contract, and leaving actually cost?

Hobby and Auth0 Free both keep logs for a day, which is a poor fit for an incident you notice on Monday, because the trail is gone before standup. Clerk Pro keeps application logs for seven days, and Business adds admin logs at 30 days, so Business is the upgrade when the admin trail has to run longer. Auth0 Essentials keeps logs for five days, Professional for 10, and Enterprise for 30. If the audit trail has to outlive the dashboard, plan on a log sink: Auth0 Essentials can stream logs, and Clerk's log sink is an Enterprise feature.

Both vendors put a 99.99% uptime SLA on Enterprise, not on the self-serve plans. Clerk's HIPAA agreement is Enterprise, and Auth0 lists HIPAA as an enterprise add-on, so healthcare needs a contract on either side. A SOC 2 report is Clerk Business, so a security review that asks for the report is a $300 plan even when Pro would have covered the users.

Leaving is uneven, since Clerk says every plan can export user data from the dashboard, and migration help is part of Enterprise. Auth0's pricing FAQ says you can export through the User Import/Export extension or the Management API. Neither page promises that password hashes will import somewhere else, so budget a password reset if you switch, and confirm the export format before you treat either store as temporary.

Auth0's pricing page says its startup program is free for a year. Clerk's startup offer is limited to companies within a year of launch and up to $5 million in venture funding, and the page does not print the discount. Ask both programs for a written price before you model it.

Who should pick Clerk, and who should pick Auth0?

Pick Clerk Hobby for a side project under the retained-user cap, with the social-provider cap, no second factor, and the fixed session length you can tolerate. Pick Clerk Pro when the app is the product, the login should be components in the tree, and the seat cap covers the dashboard. Pick Clerk Business when a fourth person needs a seat or a customer asks for the SOC 2 report.

Pick Auth0 Free when passkeys, passwordless, and one enterprise connection cover the app and you are under the free user cap, with the admin cap still enough. Pick B2C Essentials when you need OTP or Duo and a separate dev tenant, and you have priced the slider at your real user count rather than the $35 starting step. Pick B2C Professional when the user database has to stay yours. Pick B2B Essentials when customers bring their own identity provider and the included connections are enough.

Pick neither when auth is only a table next to the database. Supabase and Firebase price that combination differently, and Supabase vs Firebase is the comparison. The project fee under Supabase Auth is Supabase pricing. A backend that ships auth with the rest of the API is the backend-as-a-service roundup, which includes the Appwrite review. The host beside the login is the Vercel review and the serverless platforms list.

How did we compare Clerk and Auth0 from the pricing pages?

We read Clerk's pricing page and Auth0's pricing page on 18 October 2026, including Auth0's B2C and B2B slider and the yearly toggle, plus Clerk's Next.js quickstart and Auth0's Universal Login docs.

The $675 monthly gap and the $8,100 twelve-month gap multiply those published monthly prices. The $175 figure for three Clerk connections does the same with the Pro fee and the extra-connection rate. Louis Corneloup, founder of Dupple and Toolradar, wrote the verdict. Devshot's editorial rules are on the about page. Re-check both pricing pages before you sign, because Auth0 bills the next slider step up when your users fall between marks.

FAQ

Which is better for developers in 2026, Clerk or Auth0?

Clerk is the better default when the app is React or Next.js, login should be components in the layout, and authenticator MFA has to be on without jumping to a per-user ladder. Auth0 is the better default when the free plan's passkeys, unlimited social connections, and one enterprise connection are enough, or when the user database and the hosted login page matter more than the component kit.

Three dashboard seats on Clerk Pro, and three admins on Auth0 Free, push a larger team onto a higher plan before the user cap does.

How much does Clerk cost compared with Auth0 at 10,000 users?

With authenticator MFA on, and retained users on Clerk set against monthly active users on Auth0 at that count, Clerk Pro stays at its platform fee and Auth0 B2C Essentials is $700/mo. The difference is $675 a month, or $8,100 over twelve monthly invoices, which is our multiplication. Without that second factor, both free plans still cover the count, so both bills are zero until a feature or a seat forces an upgrade.

A one-time signup counts on Auth0 if they authenticated, and does not count on Clerk, so the same launch can be free on one side and billable on the other.

Is Auth0's free plan enough for a production app?

It can be, up to 25,000 monthly active users, with passkeys, passwordless, unlimited social connections, five organizations, and one enterprise connection, and with no credit card until you add a custom domain. It is not enough when you need OTP or Duo, another admin past the free cap, a separate production tenant, or logs older than a day.

Moving to B2C Essentials or Professional drops the enterprise connection, self-service SSO, and SCIM unless you switch the plan to B2B.

Does Clerk include authenticator MFA on the free plan?

No. Authenticator apps, SMS codes, and backup codes start on Pro, and so do passkeys, so Hobby cannot be a production login that needs a second factor. Hobby does include the prebuilt sign-in UI, the social-connection cap, and the retained-user allowance. Pro features can be tried in the development instance, and production is what requires the upgrade.

SMS on the paid plans is $0.01 per message in the US and Canada, and an authenticator app does not use that line.

Which fits B2B SaaS when customers bring their own SSO?

Clerk Pro plus the B2B add-on fits when you need custom roles and more than 20 members in an organization, and when one included SSO connection, plus $75/mo for each extra one, is cheaper than Auth0's B2B slider at your user count. Auth0 B2B Essentials fits when you want three enterprise connections included and unlimited organizations, starting at $150/mo for 500 users, and you have checked the higher step in the table before you assume that starting price will hold.

Auth0 Free already includes one enterprise connection, and a paid B2C plan does not keep it, so Free can beat Essentials for a single customer identity provider.

Can you export users if you leave either product?

Clerk includes a dashboard export on every plan, and hands-on migration help on Enterprise. Auth0's pricing FAQ points to the User Import/Export extension and the Management API. Neither pricing page says password hashes will drop into the other product, so a move can mean a password reset. Read the export docs before you treat the user store as a temporary stop.

Cite this: Devshot, "Clerk vs Auth0 (2026): Which Is Better for Developers?", October 2026.

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