Best IdentityServer4 Alternatives & Competitors in 2025

ASP.NET Identity is a membership-based software system designed for the authentication and authorization of the users via building an ASP.NET application.

DotNetOpenAuth is a free-to-use compiled library that comes with the real support to your site visitor to login with the help of openIDs via getting control of the ASP.NET control onto the page.

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OAuth is an open standard for authorization. It allows users to share their private resources (e.g.

Okta Workforce Identity is utility software for enterprises that provides a new way of work that enable your employees, contractors, and partners to use technology on any device.

BugMeNot is a free Internet service that provides usernames and passwords to allow users to bypass the registration process for websites.

This site is additionally justified regardless of a brief specify yet appears to have a couple of inconveniences.

ASP.NET SAML is an open-source authentication utility that has been used for exchanging authentication and authorization data between the channels.

Open Source Identity and Access Management for modern Applications and Services.

Open Source

OpenID is a safe, faster and easier way to log in to web sites.

Open Source

PwdLess is an open-source and reliable authentication server that legitimizes you to register or login users without the need for a password.

An open-source, standards-compliant, and flexible OpenID Connect and OAuth 2.x framework for ASP.NET Core

Open Source

OpenIddict aims at providing a versatile solution to implement an OpenID Connect server and token validation in any ASP.NET Core

humanID is a one-click anonymous SSO that provides users with an anonymous identity layer.