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It's a split decision.
Choose WorkOS for B2B apps that need enterprise SSO or directory sync: AuthKit includes up to 1 million monthly active users, while SSO and Directory Sync start at $125 per connection monthly. Choose Auth0 for a wider mix of social, passwordless, machine, and AI-agent identity features, or a $35 Essentials plan. Auth0’s free tier caps at 25,000 monthly active users; check plan limits and add-on prices before committing. Neither publishes seat-based pricing in the published details.
01Side by side
| WorkOS | Auth0 | |
|---|---|---|
| Starting price | AuthKit: free, up to 1 million monthly active users | Free tier; Essentials costs $35 monthly |
| Free plan | AuthKit includes up to 1 million monthly active users | Free tier includes up to 25,000 monthly active users |
| Best for | B2B apps adding enterprise identity features | Apps needing varied authentication and access features |
| Core strength | Enterprise SSO, directory sync, and admin onboarding | Social, passwordless, machine, and AI-agent identity |
| Learning curve | Not published on the vendor's site material | Not published on the vendor's site material |
| Integrations/data | SAML, OIDC, SCIM, and HRIS integrations | Enterprise connections, SCIM, social logins, and M2M |
| Team/seat costs | No seat pricing; SSO and Sync charge per connection | No seat pricing; plans specify monthly active-user caps |
| Support | Dedicated Slack; Annual Credits includes guaranteed support SLA | Support terms not listed on the vendor's site |
WorkOS Choose WorkOS if
- Choose WorkOS if enterprise SSO is central to your product.
- Choose WorkOS if directory sync and corporate IT onboarding matter.
- Choose WorkOS if free authentication up to 1 million monthly active users fits.
Auth0 Choose Auth0 if
- Choose Auth0 if social and passwordless login are priorities.
- Choose Auth0 if you need machine or AI-agent identity features.
- Choose Auth0 if a published $35 Essentials plan fits your needs.
02Pricing compared
WorkOS AuthKit is listed at $0 for up to 1 million monthly active users. Enterprise features cost extra: Single Sign-On and Directory Sync each start at $125 per connection per month for 1–15 connections, with listed rates falling to $65 per connection for 51–100. WorkOS also offers custom-priced Annual Credits; its rates are not published.
Auth0 lists a free plan with up to 25,000 monthly active users and Essentials at $35 per month, capped at 500 monthly active users. Professional is $240 per month and also lists a 500-user cap. That makes the plan names and MAU limits worth checking closely before budgeting. Auth0’s annual rates and add-on prices are not published on the vendor's site. Neither product lists seat-based pricing here.
03Features and depth
WorkOS is oriented toward enterprise identity features for applications. Its feature list includes SAML and OIDC single sign-on, SCIM and HRIS directory sync, organization and user management, an admin portal, MFA, and role-based or fine-grained access control. AuthKit covers authentication and user management, with up to 1 million monthly active users included. SSO and Directory Sync are priced separately by connection.
Auth0 covers a broader mix of login and identity use cases in its listed features: social and passwordless login, embedded login, adaptive MFA, bot detection, enterprise SSO and SCIM, and customer-managed organizations. It also lists machine authentication for services and APIs, plus identities and access controls for AI agents and RAG data. Some related features, including Advanced Security Features, Bot Detection, Adaptive MFA, and Auth for MCP, are listed as add-ons, but their prices are not published. For a B2B product prioritizing enterprise connections and directory lifecycle data, WorkOS has a direct fit; Auth0’s feature list spans more identity types.
04Ease of use and learning curve
The published details do not establish which product is easier to implement or administer. The review scores rate Auth0’s ease of use at 7/10 and WorkOS at 6/10, but those scores do not explain the work involved for a particular app.
The pricing models do give teams different decisions to make. WorkOS separates free AuthKit from per-connection SSO and Directory Sync charges, so estimate the number of customer connections before adopting those features. Auth0 groups limits into named plans, but its Free plan allows more MAUs than the listed Essentials and Professional plans. Check the exact features, MAU cap, and any paid add-ons your deployment needs before switching.
Questions people ask
Which is cheaper, WorkOS or Auth0?
It depends on what you need. WorkOS AuthKit is free up to 1 million monthly active users, but SSO and Directory Sync start at $125 per connection per month. Auth0 lists Essentials at $35 per month, capped at 500 monthly active users; add-on prices are not published.
Does WorkOS include enterprise SSO for free?
No free SSO allowance is listed in the published WorkOS pricing. AuthKit is free up to 1 million monthly active users, while Single Sign-On is priced per connection per month: $125 for 1–15 connections, with lower listed rates at higher connection counts.
Does Auth0’s free plan include enterprise SSO?
The Auth0 Free plan lists one enterprise connection, alongside a 25,000 monthly active user cap, one custom domain, five organizations, and one tenant. The published pricing details do not specify whether that connection covers every enterprise SSO setup or feature.
Which should we choose for a B2B app?
Choose WorkOS if your priority is enterprise SSO or directory syncing and you can budget for per-connection charges. Consider Auth0 if you need its listed mix of social, passwordless, machine, or AI-agent identity features. Compare the relevant MAU limits and unpublished add-on costs before deciding.