Best Free Authentication Software of 2025

Aerobase is an open-source Identity & Access Management (IAM) platform. It specializes in identity Federation, SSO, strong authentication, adaptive authentication, access control and account management. API & Microservices security and privacy regulation are some of its specialties. This guide will help you get started with Aerobase. This guide covers server configuration and the use of the default data base. Advanced deployment options are not covered. Refer to the other reference guides for a more detailed description of features and configuration options.

Appwrite offers a cloud backend solution, simplifying the construction of your backend infrastructure with minimal coding across preferred languages and frameworks. This platform empowers developers to concentrate on creativity and design, minimizing the grind of backend development chores. Products Appwrite provides you with: - Authentication: 30+ login methods, support for teams, roles, and user labels - Databases: Never paused, fast in-memory caching, advanced permission models, relationships support - Storage: File encryption at rest and transit, built-in image transformation capabilities, advanced compression with WebP/Brotli support - Functions: Automatic deployment from GitHub - Messaging: SMS, email, and push notification support - Real-time: Unlimited subscriptions By utilizing Appwrites’ features, you save time and ensure your products are stable and secure for your end users. With Appwrite, you always own your data, so you never have to fear vendor lock-in.

You can control the distribution and access to your software product. You have many options to make your software product flexible. You can create short-term access keys, notify users when updates become available, view access logs, and even allow resellers to purchase new keys without having to contact you. Choose from registration-required or key-only authentication for each application. Your users will appreciate the speed if key-only authentication is what you prefer. Users can choose to verify their email address or their Discord account if they are required to register on System Locker. Our commitment to reliability is strong, even though hundreds of new users join every single day.

We are dev-tool specialists and understand all the pitfalls of building for the web. We have created the authentication platform that you've always wanted. It works, and you can still control your user data and experience. Our team of web-security experts is focused on helping you ship your product securely without worrying about all the details. Our APIs are designed to be compliant with industry best practices and are regularly audited annually by third parties. We understand that auth is a core part of your app and we go above and beyond for you to ensure you are well supported. You can always reach someone for any questions or assistance in an emergency. We offer industry-leading SLAs and support arrangements.

We make it simple for developers to secure their cloud apps. Adapt your authorization model so that it supports the principle of least privilige with fine-grained accessibility. Authorization decisions are based on the users, groups, domain models, resource hierarchy and relationships between them. Locally make authorization decisions using real-time information in milliseconds with 100% availability. Locally enforce using real-time information. Manage policies from one location. Define and manage all policies for your applications from a central location. Spend less time on access control and more time delivering core features. Allowing policy and code to develop independently will streamline the interaction between engineering and security. Create a secure supply chain for software that supports your policies. Store and version code for your policies in a git repository, just like you would any other code. Just like any other application artifact, you can build, tag, sign and immutable images of your policies.

MonoCloud is a developer-oriented platform that simplifies authentication, authorization, and user management across a range of platforms, including web, mobile, and IoT devices. It allows developers to easily incorporate secure and customizable login flows, supporting multiple authentication methods such as passwords, magic links, one-time passcodes, and social logins from providers like Google, Facebook, and Apple. With a focus on reducing user friction, MonoCloud provides a seamless and branded authentication experience. The platform includes advanced features like mutual TLS, brute-force protection, and global session management, offering a complete solution for managing user access across various applications and devices. Additionally, MonoCloud supports a developer-friendly approach with comprehensive documentation, integration guides, and compatibility with various front-end and back-end frameworks, enabling developers to implement robust authentication solutions efficiently and effectively.

WSO2 Identity Server API-driven is built on open standards and offers the option of cloud, hybrid, or on-premise deployments. It is highly extensible and can support complex IAM requirements. WSO2 Identity Server allows you to do single sign-on as well as identity federation. It is backed up by strong and adaptive authentication. Securely expose APIs and manage identities by connecting with heterogeneous user accounts. Open-source IAM can be used to innovate quickly and to build secure Customer IAM solutions (CIAM) to deliver a user-friendly experience.

Konfirmi makes it easy to set up verification for your website or app. You can use it standalone or in combination with other services. Verification methods include: – 2 Factor authentication / Multi Factor authentication (2FA/MFA), – SMS/Email verification, - True age verification with KBA Checks, - True customer name/address/info verification (KBA checks), - Biometric authentication - Single Sign on (SSO). You can check your age, addresses, and photo IDs. Add to any website or app quickly. Respect various laws in the USA and other countries. There are two options for small business and enterprise. Konfirmi's patent-pending system lets you automatically verify customer information such as age, physical address and email address. Konfirmi can be quickly integrated into your website or application.

We have you covered, no matter what channel or device. You can choose from a variety of user-friendly authentication options, including passwordless biometrics and 2FA, to find the right authentication solution for your business. To improve security and user experience, start with 2FA. Then move on to biometrics-based authentication. Our SaaS-based authentication service, RESTAPs, mobile SDKs, and UI widgets offer a powerful combination software components that can all be used to create omni-channel authentication experiences across mobile, web, phone and IoT. It's time to remove the security burden from users! Our mission is to make the digital world more secure and open up access to strong authentication technology. ThumbSignIn is a SaaS-based service that helps companies choose the best way to enhance their existing systems with two factor authentication (2FA).

Authgear is a flexible authentication solution that helps businesses manage their users better, reduce fraud, alleviate password fatigue and accelerate the development team's timeline. It allows developers to integrate 2FA, Session Management and Magic-link into their apps in a matter of minutes. Authgear also offers an Admin Portal that allows developers and IT support to manage user sessions and user access and analyze event logs.

Studid allows students, researchers, and educators to authenticate natively using the SSO (Single Log-on) Service at their institution.

BotDelive is a 2FA service and push notification service via IMbots for developers. Register on BotDelive to get your API credentials. Learn our API documentation before you start integrating! To integrate 2FA, you will only need 2 API endpoints. BotDelive is a cloud communication platform that developers can use. It allows developers to send push notifications and 2FA messages over chat apps using its APIs. To send notifications, you must normally force your user into installing an app. The chat apps are already installed on millions upon millions of devices. Why not use them? BotDelive provides 2FA in a snap. Users can authorize their accounts by answering only the yes/no questions. BotDelive can authenticate users instead of password and e-mail. BotDelive will only ask for the password once, and it will handle all subsequent requests. Chat apps allow you to send important push notifications. BotDelive ID is reliable.

Security Building Blocks for Developers. BoxyHQ offers a suite of APIs for enterprise compliance, security and privacy. It helps engineering teams to reduce Time to Market without sacrificing their security posture. They can implement the following features with just a few lines of code. SaaS or Self-hosted. 1. Enterprise Single Sign On (SAML/OIDC SSO) 2. Directory Sync 3. Audit Logs 4. Data Privacy Vault (PII, PCI, PHI compliant)

Sima does more than keep bad guys out. Sima is a cloud-based Access Control reader that is highly secure and yet easy to use. Sima can read both facial biometrics and mobile credentials (QR codes). This cloud-based integrated software can issue single (QR only), and multi-factor (facial verification) codes for highly secure and customized facility access. We respect your privacy. To perform facial authentication, we use facial recognition technology. This technology allows us to verify identity, and allow access to a specific location. Only for identification purposes, facial data will be stored on our servers. We will not share your personal data, including your face image, with any third parties.

IDmelon Authenticator, a mobile app that is available on Google Play or App Store, allows you to turn your smartphone into a FIDO-certified security key that allows you to securely log in to websites, online accounts, apps, and other sites. This means that instead of using the traditional method of presenting your username or password to log in to accounts like Microsoft or GitHub, you can use your username and security keys to add an extra layer of security. Organizations can use IDmelon Admin Panel to login to manage users, security keys, and to deploy passwordless authentication within their organizations overnight to protect their data, employees, and assets.

The missing web-scale identity and access control API. Today, 10x your security and user experience. Build secure apps over the Ory Network to reach new customers in any region of the globe with the best login experiences ever. Login is much more than just a username and a password. It is dangerous and time-consuming to build it from scratch. Ory's API first microservice architecture allows projects to be integrated at any stage. Pay for usage and not features. Ory subscription plans include advanced multi-factor authentication. Plus, advanced permissions, SSO OAuth2, OIDC multi-tenancy and more. Ory is designed for high-performance and high-scale applications on any cloud. Ory is designed with developers in mind. It allows you to quickly create your own user experience, and integrate it within your software stack. Ory's focus is on open standards, and its automated data import capabilities make migrating to legacy systems simple.

Customers want features you can't provide without a refactor. Your code is fragile, hand-rolled and difficult to debug. It is spread across the codebase, and relies on multiple sources of data. There is no central place to check who has access to which data, how authorization works, or why requests have been approved or not. Workbench is our visual rule editor. Start by defining who can do what. Then, extend your logic using Polar, our configuration language. Send core authorization data like roles and permissions. Authorization checks and filter lists based upon authorization are now possible instead of IF statements and custom SQL.

Created by engineers and founders to help you generate more revenue for your business, reduce costs and create lifelong loyal customers. All in one place. Many businesses still use traditional passwords to gain access. Passwords can be easily distributed and, when the time comes, you can convert them with a flick of the switch. Machine-to-machine connectivity combined with connected apps can accelerate your product development on the backend and enable powerful product interaction and security. Give your users advanced authentication options to protect them from reusing or breaching passwords. Continuous deployment with features will help your team deliver new experiences, increase their speed of learning and release and improve the overall experience.

Developers will find it easy to integrate and use the APIs. User management built-in for teams that interact with customers. Data and insights for executives and PMs. PropelAuth was built on the belief that a great authentication product should get out of your way. We give you the tools you need to make sure your users have a smooth and secure experience. Your team will be given a list of tasks and information to complete as soon as they begin onboarding new users. PropelAuth is a first class concept when it comes to organizations. Our UIs will help you get started quickly, or you can build your own using our APIs. Create your own roles or start with our defaults. We will even update existing users when you make changes. Integrating with identity providers like Okta or Azure AD is easy. We provide guides to help your users set up and test configuration. Set custom session durations for each organization, enforce MFA and more. We take care of the complexity, so you don't need to.

ZITADEL, an open-source platform for identity and access management, simplifies authentication and authorization of applications. It has a wide range of features including customizable hosted logins pages, support for authentication methods like Single Sign-On (SSO), social logins and multifactor authentication. Developers can integrate authentication into their applications directly using ZITADEL APIs or create dedicated login interfaces. The platform is multi-tenant and supports role-based control. This allows for precise permissions based on roles. ZITADEL’s extensibility allows for seamless adaptation to workflows, user-management processes, and brand guidelines. Features like ZITADEL Actions execute workflows based on predefined events, without the need for extra code deployment.

NextAuth.js, an open-source authentication solution, is tailored for Next.js apps, offering seamless integration with services like Google, Facebook Auth0 and Apple. It supports a variety of authentication methods including OAuth 1.0 &2.0, email/passwordless logins, and custom username/password system. NextAuth.js is designed for flexibility. It works in serverless environments, and supports multiple databases, including MySQL, PostgreSQL and MSSQL. Developers can choose between JSON Web Tokens or database sessions. Security features include HTTP POST validation of CSRF tokens, signed, prefixed server-only cookies and encrypted JWTs based on JWS/JWE/JWK. The platform is easy to set up, allowing developers to add authentication within minutes with minimal configuration. A comprehensive documentation and a supportive developer community make it more accessible to developers looking for a robust authentication system.

Auth.js provides a flexible, secure authentication experience. It is an open-source library that integrates seamlessly with modern JavaScript Frameworks. It supports a variety of authentication methods including OAuth (e.g. Google, GitHub), Credentials, and WebAuthn. This allows developers to select the best approach for their application. Auth.js supports multiple frameworks such as Next.js (e.g., Google, GitHub), SvelteKit (e.g., Express), Qwik and SolidStart. This allows developers to implement authentication on different platforms. The library provides built-in support to popular databases such as Prisma, Drizzle ORM (Object Relational Mapper), Supabase (Supabase ORM), Firebase and TypeORM. This simplifies user data management. Signed cookies, CSRF validation, and encrypted JSON Web Tokens are all security features that ensure robust protection of user data. Auth.js has been designed to work efficiently in serverless environments. It also provides extensive documentation and examples.

Zoho Directory, a cloud-based platform for identity and access management, is designed to streamline authentication and authorization. It also simplifies user management. Single Sign-On (SSO), which allows employees to access multiple apps with a single set credentials, enhances security and user convenience. Multi-Factor Authentication is supported by the platform, adding an additional layer of protection from unauthorized access. Device authentication provides secure access to applications and devices. Employees can use the same credentials on all platforms. Zoho Directory offers robust provisioning capabilities, which allow IT administrators to create user profiles for various applications from the platform. This reduces the time spent on repetitive work. Directory stores facilitate integration with existing directories such as Microsoft Active Directory or Azure AD.

The authentication platform for developers. Stytch's APIs allow you to authenticate, sign up, and engage with your users. Flexible, passwordless authentication solutions that improve security and user experience. Let us help you build the infrastructure so that you can concentrate on your product. Our SDKs allow you to create seamless onboarding and authentication experiences. They can be customized to your logo, colors, fonts, or logo. Our direct API integration gives you more control over your user experience. It considers both the developer and user experience and ensures fast, secure, and passwordless authentication flows. With clear and complete documentation, we make integration easy and painless.

The Teleport Infrastructure Identity Platform is a modernization of identity, access and policy for infrastructure for both human and not-human identities. It improves engineering velocity and resilience of critical infrastructure to human factors or compromise. Teleport is designed for infrastructure use cases. It implements trusted computing with unified cryptographic identity for humans, machines, and workloads. Endpoints, infrastructure assets and AI agents can all be identified. Our identity-everywhere solution vertically integrates identity governance, zero trust networking and access management into a single platform. This eliminates overhead and operational silos.