Keycloak vs Auth0 vs Okta: The Real Cost Comparison in 2026

Why IAM Costs Matter More Than Ever

Identity and Access Management is one of those line items that starts small and grows fast. At 1,000 users, Auth0 or Okta feels like a bargain. At 100,000 users, it becomes one of your largest SaaS expenses. At 1 million users, it can cost more than your entire engineering team.

This guide breaks down the real costs of running Keycloak, Auth0, and Okta at different scales — including the hidden costs that vendor pricing pages don't show.

The Pricing Models

Auth0 (by Okta)

Auth0 charges based on Monthly Active Users (MAU). This means your costs scale linearly with your user base — the more users who log in each month, the more you pay.

• Free: Up to 25,000 MAU (limited features)
• Essentials: Starting at ~$35/month
• Professional: Starting at ~$240/month
• Enterprise: Custom pricing, typically $50,000 - $300,000+/year

The catch: enterprise features like Organizations (multi-tenancy), custom domains, and advanced MFA are locked behind higher tiers.

Okta (Workforce Identity)

Okta uses per-user, per-feature pricing. Each capability is a separate line item:

• Single Sign-On: $2 - $6/user/month
• Adaptive MFA: $3 - $6/user/month
• Lifecycle Management: $4 - $9/user/month
• Full platform bundle: $8 - $15/user/month

For a company with 10,000 employees, Okta typically costs $100,000 - $1,800,000/year depending on which features you need.

Keycloak (Self-Hosted)

Keycloak is free and open source (Apache 2.0). Your costs are infrastructure and operations:

• Software license: $0
• Infrastructure: $200 - $2,000/month depending on scale and cloud provider
• Operations: Internal engineering time or a managed service

Side-by-Side Cost Comparison

Here is what you would actually pay at different scales:

1,000 Users (Startup)

Provider	Monthly Cost	Annual Cost
Auth0 Professional	~$240	~$2,880
Okta SSO + MFA	~$8,000	~$96,000
Keycloak on AWS	~$200	~$2,400

At startup scale, Auth0 and Keycloak are comparable. Okta is expensive because their per-user model doesn't favor small teams.

10,000 Users (Growth Stage)

Provider	Monthly Cost	Annual Cost
Auth0 Enterprise	~$4,200	~$50,000
Okta Full Platform	~$10,000	~$120,000
Keycloak HA Cluster	~$800	~$9,600

This is where the gap starts to widen. Keycloak costs 80% less than Auth0 and 92% less than Okta.

100,000 Users (Scale)

Provider	Monthly Cost	Annual Cost
Auth0 Enterprise	~$15,000	~$180,000
Okta Full Platform	~$80,000	~$960,000
Keycloak HA Cluster	~$1,500	~$18,000

At 100,000 users, Keycloak saves you $162,000/year compared to Auth0 and $942,000/year compared to Okta. The infrastructure cost barely moves because Keycloak doesn't charge per user.

1,000,000 Users (Enterprise)

Provider	Monthly Cost	Annual Cost
Auth0 Enterprise	Custom (~$25,000+)	~$300,000+
Okta Full Platform	Custom	~$2,000,000+
Keycloak Multi-Region	~$3,000	~$36,000

At this scale, the difference is staggering. Keycloak's infrastructure cost is a rounding error compared to commercial IAM pricing.

The Hidden Costs

Auth0 / Okta Hidden Costs

• Overage charges: Go over your MAU tier and you pay premium rates
• Feature upsells: Multi-tenancy, custom domains, and advanced security are premium-tier only
• Migration costs: Vendor lock-in makes switching expensive — proprietary SDKs, custom rules, and tenant configurations don't transfer
• Compliance add-ons: HIPAA, SOC 2 compliance features often require enterprise tier

Keycloak Hidden Costs

• Operational expertise: Someone needs to manage upgrades, security patches, and scaling. Budget 3-5 hours/week for a production cluster.
• Initial setup: Getting a production-grade HA cluster right takes expertise. A poorly configured Keycloak deployment can be worse than Auth0.
• Learning curve: Keycloak is powerful but complex. Your team needs to understand realms, clients, flows, and SPIs.

When to Choose Each

Choose Auth0 When

• You have fewer than 10,000 MAU and need to move fast
• Your team has zero IAM expertise and doesn't want to learn
• You need to be production-ready in days, not weeks
• Cost is not a primary concern

Choose Okta When

• You're a large enterprise with complex workforce identity needs
• You need deep integrations with HR systems (Workday, SAP)
• Compliance requirements mandate a SOC 2 certified vendor
• Budget is available for premium pricing

Choose Keycloak When

• You have 10,000+ users and costs are becoming a concern
• You want full control over your identity infrastructure
• Data sovereignty or regulatory requirements demand self-hosting
• You're building a SaaS product that needs multi-tenancy
• You want zero vendor lock-in

The Managed Keycloak Middle Ground

The biggest objection to Keycloak is operational overhead. You don't have to do it alone. Managed Keycloak services (like what we offer at KeycloakPro) give you the cost benefits of open source with the operational simplicity of a managed service.

A typical managed Keycloak engagement costs $800 - $3,500/month — still a fraction of Auth0 or Okta at scale, but without the burden of managing infrastructure yourself.

Bottom Line

At small scale, Auth0 is convenient and affordable. At any meaningful scale (10,000+ users), Keycloak delivers 70-90% cost savings with no compromise on features. The key is getting the initial deployment right — a well-architected Keycloak cluster is as reliable as any commercial solution.

The identity market is shifting. Okta's pricing changes and security incidents have accelerated migration to open-source alternatives. Keycloak, backed by Red Hat and the CNCF, is the clear leader in this space.

The question isn't whether Keycloak can do what Auth0/Okta does. It can. The question is whether you want to keep paying 5-10x more for the same capabilities.