Pricing overview
IdentityServer, maintained by Duende Software, utilizes a licensing model designed to support various use cases, ranging from individual development to large-scale enterprise deployments. The core principle is that IdentityServer is free for non-production use, including development, personal projects, and open-source initiatives. Commercial and production use cases, however, require a paid annual license. This model ensures that Duende Software can sustain the development and maintenance of the IdentityServer project while allowing broad access for initial exploration and non-commercial applications. The licensing structure is tiered, with different editions offering varying features, support levels, and pricing points tailored to organizational size and complexity of deployment.
The transition from the previous open-source project to the current Duende IdentityServer, under a commercial license, was a significant change in its distribution model. This shift was implemented to provide a sustainable funding model for the project's continued development and support, as detailed in the official Duende Software licensing information. This approach is common among projects that originate in the open-source community but require dedicated resources for long-term viability and professional support for commercial users.
The pricing for production licenses is primarily based on an annual subscription. This includes access to specific versions of the software, bug fixes, and potentially direct support from Duende Software, depending on the chosen tier. The cost scales with the features required and the operational scope, ensuring that businesses can select a plan that aligns with their specific identity management needs and budget constraints.
Plans and tiers
Duende IdentityServer offers several licensing tiers for production use, each designed to meet different organizational requirements and budgets. These tiers provide access to the IdentityServer software, along with varying levels of support and additional features. The primary distinction among plans often lies in the number of production instances, support response times, and access to advanced features or consultations.
The pricing model is based on an annual subscription per production deployment. A “production deployment” typically refers to a single instance or cluster of IdentityServer running in a live environment, serving end-users or applications. Development, staging, and test environments usually do not require separate paid licenses under the terms of the free usage allowance, though specific details should always be verified on the Duende Software IdentityServer licensing page.
Comparison Table of IdentityServer Paid Editions
| Plan | Annual Price (approx.) | Key Limits / Features | Best For |
|---|---|---|---|
| Community Edition | €1,500 |
|
Organizations with limited budget and a single production instance |
| Business Edition | €5,000 - €10,000+ (variable) |
|
Growing businesses requiring multiple deployments and enhanced support |
| Enterprise Edition | Custom quote |
|
Large enterprises with complex identity needs, stringent SLAs, and extensive deployments |
Note: Prices are approximate and subject to change. For the most current and precise pricing, always refer to the official Duende Software licensing page.
Each edition provides a specific set of functionalities and support guarantees. The Community Edition is designed for smaller organizations or projects that require a single production instance and can manage with best-effort email support. As organizations grow or their needs become more complex, the Business and Enterprise editions offer increased flexibility, more robust support options, and access to features essential for large-scale, mission-critical identity infrastructure.
Free tier and limits
IdentityServer offers a comprehensive free tier that covers a wide range of non-commercial and development use cases. This free usage policy is a critical component of its accessibility and adoption within the developer community. The free tier explicitly permits the use of IdentityServer for:
- Development purposes: This includes all stages of software development, testing, and staging environments. Developers can fully implement, test, and refine their identity solutions without incurring licensing costs until they move to a production environment.
- Personal projects: Individuals working on personal applications, hobbies, or learning initiatives can use IdentityServer without charge.
- Open-source projects: Projects licensed under a recognized open-source license are eligible for free use, promoting collaboration and innovation within the open-source ecosystem. This allows open-source projects to leverage a robust identity solution without financial barriers.
- Educational use: Academic institutions and students can typically use IdentityServer for learning and research without a paid license.
The primary limitation of the free tier is its restriction from production use in commercial contexts. Once an application utilizing IdentityServer is deployed to a live environment where it serves actual users or commercial services, a paid license is generally required. The definition of “production environment” is typically an environment that is exposed to external users or processes that generate revenue or support core business operations. Specifics are detailed in the Duende Software IdentityServer licensing terms.
This free tier model allows developers and organizations to thoroughly evaluate IdentityServer, build prototypes, and integrate it into their non-production workflows without upfront investment. It also aligns with common practices in the software industry where tools are often freely available for development and then commercialized for production deployments, similar to how many database systems or developer tools operate.
Real-world cost examples
Understanding the practical costs of IdentityServer involves considering various deployment scenarios. These examples illustrate how the licensing tiers translate into annual expenses for different types of organizations:
Scenario 1: Small Startup with a Single Application
- Description: A startup is launching its first commercial product, a web application that requires user authentication and authorization. They anticipate a moderate user base and plan to deploy IdentityServer on a single production server.
- IdentityServer Needs: Basic OpenID Connect and OAuth 2.0 capabilities, email support.
- Recommended Plan: Community Edition
- Estimated Annual Cost: €1,500
- Justification: The Community Edition is suitable for a single production deployment with standard features, meeting the startup's initial requirements while keeping costs manageable.
Scenario 2: Mid-sized Company with Multiple Microservices
- Description: A growing company operates several microservices and internal applications, each requiring secure authentication. They need to deploy IdentityServer across multiple instances for high availability and redundancy, and desire faster support response times.
- IdentityServer Needs: Multiple production deployments, priority support, advanced features for microservice authentication.
- Recommended Plan: Business Edition
- Estimated Annual Cost: €5,000 - €10,000+ (depending on specific requirements and number of deployments)
- Justification: The Business Edition accommodates multiple production deployments and offers enhanced support, which is critical for a more complex microservice architecture. The exact cost would depend on the negotiated terms for their specific number of deployments.
Scenario 3: Large Enterprise with Global Operations
- Description: A large enterprise with operations across multiple regions needs a robust, highly available, and scalable identity solution to manage millions of users and hundreds of applications. They require stringent Service Level Agreements (SLAs), dedicated support, and potentially custom development or consulting.
- IdentityServer Needs: Unlimited production deployments, 24/7 dedicated support, custom features, consulting, and guaranteed uptime.
- Recommended Plan: Enterprise Edition
- Estimated Annual Cost: Custom quote (typically tens of thousands to hundreds of thousands of Euros)
- Justification: The Enterprise Edition provides the highest level of support, unlimited deployments, and customization options necessary for a global enterprise. The cost is negotiated based on the scale of deployment, specific support requirements, and any additional services.
How the pricing compares
When evaluating IdentityServer's pricing, it's useful to compare its model with other identity management solutions, particularly those offering similar OpenID Connect and OAuth 2.0 capabilities. The landscape includes commercial Identity-as-a-Service (IDaaS) providers and other open-source alternatives.
Comparison with IDaaS Providers (e.g., Okta, Auth0)
IDaaS providers like Okta and Auth0 typically operate on a subscription model based on the number of monthly active users (MAU) or active users. Their pricing often includes hosting, infrastructure, and managed services, abstracting away the operational complexities of running an identity provider. For example, Auth0's pricing starts with a free tier for up to 7,000 MAU and then scales significantly with higher user counts and advanced features. Okta also offers various tiers based on features and user volume. While these services offer convenience and offload infrastructure management, their costs can escalate rapidly with a large user base, potentially becoming more expensive than a self-hosted solution like IdentityServer, especially for organizations with millions of users.
IdentityServer, being a software component that organizations host themselves, requires internal infrastructure and operational expertise. The cost of IdentityServer licenses is fixed per deployment (or scales with the edition), regardless of the number of users. This can be a significant cost advantage for organizations with very high user counts, where the per-user cost of an IDaaS provider would be prohibitive. However, organizations must factor in the costs of infrastructure (servers, databases, networking), operational staff, and security maintenance, which are included in IDaaS pricing.
Comparison with Open-Source Alternatives (e.g., Keycloak)
Keycloak is a popular open-source identity and access management solution that is truly free to use and deploy without any licensing fees for production. Like IdentityServer, it provides OpenID Connect and OAuth 2.0 capabilities and requires self-hosting. The primary difference lies in the commercial support model. While Keycloak has a large community and can be supported by Red Hat (via Red Hat SSO), there isn't a direct commercial entity solely focused on its development and licensing in the same way Duende Software manages IdentityServer.
For organizations choosing Keycloak, the “cost” comes in the form of internal development talent needed for setup, customization, and ongoing maintenance. There are no direct software licensing costs, but the investment in engineering resources can be substantial. IdentityServer's paid tiers provide direct access to the maintainers of the software, offering a level of dedicated support and assurances that might not be available with purely community-driven open-source projects or require purchasing separate commercial support from a third party.
In summary, IdentityServer positions itself as a middle ground: offering the flexibility and control of a self-hosted solution (similar to Keycloak) but with a sustainable commercial model that provides professional support and guaranteed updates (unlike purely open-source projects) at a potentially lower total cost of ownership than high-volume IDaaS providers if infrastructure costs are managed efficiently. The choice often depends on an organization's preference for self-hosting versus managed services, the scale of their user base, and their budget for direct software licensing versus internal operational expenses.