What is SimpleIdServer used for?

SimpleIdServer is an open-source identity and access management server for ASP.NET Core, supporting multiple authentication protocols. It is a good fit for organizations needing a customizable, open-source identity and access management server; deployments requiring multi-protocol authentication (OpenID Connect, SAML, WS-Federation, etc.); and enterprises that want self-hosted identity infrastructure with optional premium support.

Is SimpleIdServer open source?

Yes. SimpleIdServer is open source under the Apache-2.0 licence. Its source code is on GitHub at simpleidserver/SimpleIdServer and is written mainly in C#.

Is SimpleIdServer free?

Yes. SimpleIdServer is open source, so the software itself is free to use.

Can I self-host SimpleIdServer?

Yes. SimpleIdServer can be self-hosted on your own server or infrastructure.

What is SimpleIdServer an alternative to?

SimpleIdServer is an open-source alternative to FusionAuth. Other open-source alternatives to FusionAuth include Keycloak, ZITADEL and Logto.

Is SimpleIdServer actively maintained?

The most recent commit to SimpleIdServer was on 19 March 2026, and the latest release is v6.0.6, published on 10 October 2025. The project has 888 stars on GitHub.

SimpleIdServer: open-source alternative to FusionAuth

About SimpleIdServer

SimpleIdServer is a fully open-source identity and access management solution licensed under Apache 2.0. It supports protocols including OpenID Connect, OAuth 2.0, WS-Federation, SAML 2.0, SCIM 2.0, UMA 2.0, FAPI, CIBA, and OpenBanking. The server is built for ASP.NET Core and provides a customizable authentication interface with adaptable page templates and themes.

The solution includes flexible identity provisioning via SCIM and LDAP, an intuitive administration interface, and an EBSI-compatible digital wallet for verifiable credentials management. It can be installed via .NET templates, Docker, or Kubernetes. An enterprise support license is available for organizations needing priority support, deployment assistance, custom development, and consultancy.

Key features

Supports OpenID Connect, WS-Federation, SAML 2.0, OAuth 2.0, SCIM 2.0, UMA 2.0, FAPI, CIBA, and OpenBanking
Customizable authentication interface with themes, colors, and page templates
Automatic identity provisioning via SCIM and LDAP
EBSI-compatible digital wallet for verifiable credentials management
Installable via .NET templates, Docker, or Kubernetes
Enterprise support license with priority support, deployment assistance, custom development, and consultancy

Good fit for

Organizations needing a customizable, open-source identity and access management server
Deployments requiring multi-protocol authentication (OpenID Connect, SAML, WS-Federation, etc.)
Enterprises that want self-hosted identity infrastructure with optional premium support

Built with: C# tools
Tags: identity; access management; openid connect; oauth; saml; asp.net core

SimpleIdServer: questions and answers

What is SimpleIdServer used for?: SimpleIdServer is an open-source identity and access management server for ASP.NET Core, supporting multiple authentication protocols. It is a good fit for organizations needing a customizable, open-source identity and access management server; deployments requiring multi-protocol authentication (OpenID Connect, SAML, WS-Federation, etc.); and enterprises that want self-hosted identity infrastructure with optional premium support.
Is SimpleIdServer open source?: Yes. SimpleIdServer is open source under the Apache-2.0 licence. Its source code is on GitHub at simpleidserver/SimpleIdServer and is written mainly in C#.
Is SimpleIdServer free?: Yes. SimpleIdServer is open source, so the software itself is free to use.
Can I self-host SimpleIdServer?: Yes. SimpleIdServer can be self-hosted on your own server or infrastructure.
What is SimpleIdServer an alternative to?: SimpleIdServer is an open-source alternative to FusionAuth. Other open-source alternatives to FusionAuth include Keycloak, ZITADEL and Logto.
Is SimpleIdServer actively maintained?: The most recent commit to SimpleIdServer was on 19 March 2026, and the latest release is v6.0.6, published on 10 October 2025. The project has 888 stars on GitHub.