Best Free Authentication Software of 2026 - Page 2

Clerk offers a full-stack authentication and user management system designed for modern web applications. It provides secure APIs and drop-in UI components for sign-up, sign-in, user profiles, multi-factor authentication (MFA), and organization management. Clerk supports frameworks like Next.js, React, Vue, and Nuxt, with built-in OAuth, SSO, and RBAC (Role-Based Access Control). Focused on developer experience, Clerk eliminates the need to build authentication from scratch, ensuring security and scalability without sacrificing flexibility or control.

Authentication is a pivotal moment in your customer's journey. With Kinde, you can take full control. We provide passwordless authentication, social logins, and enterprise SSO to give your users flexible, secure access. You can fully customize the UI with your own designs and domains, ensuring a seamless, on-brand experience. For complex needs, our powerful workflows let you run custom code during authentication. Plus, you can easily organize business customers using our organizations feature, allowing you to fine-tune the experience for each one. Beyond authentication, Kinde helps you monetize your business quickly. You can effortlessly create subscription plans and collect revenue. Our platform is built to support B2C, B2B, and B2B2C business models, with robust organization management and flexible billing logic that scales as you grow.

We offer the most user-friendly technology without sacrificing performance or features. We back it up with exceptional support and care delivered under a fair, cost-effective pricing model Our technology is used by small startups with big ideas, small budgets, and global enterprises. We love them all! Easy to use Load balancing, WAF, GSLB and SSO/Pre-Authentication. It is also the only true ADP Application Delivery Platform that allows for the enhancement of functionality and longevity using the app store or apps you create in-house.

Konfirmi offers a straightforward solution for integrating verification into your website or app, allowing for both standalone and combined usage. The variety of verification options includes 2 Factor Authentication (2FA), Multi Factor Authentication (MFA), SMS and email verification, age verification through Knowledge-Based Authentication (KBA) checks, customer name and address validation via KBA, biometric authentication, and Single Sign-On (SSO). This enables you to verify age, addresses, photo identification, and more with ease. Implementing Konfirmi is a swift process that can enhance any website or application while ensuring compliance with various regulations in the USA and beyond. Options are available for both small businesses and large enterprises. With its innovative, patent-pending technology, Konfirmi streamlines the verification of essential customer information such as age, physical addresses, email addresses, phone numbers, and photo IDs across various platforms, including user sign-up pages, e-commerce sites, contact forms, and surveys. Start utilizing Konfirmi today to elevate the security and reliability of your web-facing systems.

No matter the platform or device, we have the perfect solution for you. Explore our range of intuitive authentication options, including two-factor authentication (2FA) and passwordless biometric systems, to determine the most suitable setup for your organization and its users. You can initiate with 2FA and gradually adopt more sophisticated technologies such as biometric authentication, ensuring a continual enhancement of both user satisfaction and security measures. Our authentication service, built on a SaaS model, comes equipped with REST APIs, mobile SDKs, and UI widgets, enabling the creation of seamless omni-channel authentication experiences across various mediums including mobile, web, telephony, IoT, chatbots, kiosks, and physical access points. Take the responsibility of security off your users’ shoulders! We are dedicated to making advanced authentication technology accessible to all, contributing to a safer digital environment for everyone. ThumbSignIn offers affordable, scalable SaaS solutions designed to assist businesses in identifying the optimal approach to enhance their existing systems with robust two-factor authentication (2FA), ultimately fostering a culture of security. With our comprehensive offerings, companies can seamlessly integrate cutting-edge security while prioritizing user convenience.

Civic powers the future of work with seamless authentication and AI-driven workflow automation. At its core, Civic Auth offers simplified, secure user management that integrates easily into apps, platforms, and servers, blending traditional login methods with blockchain-ready capabilities. Civic Nexus builds on this by connecting SaaS, databases, and AI tools into unified workflows that scale with your business. Instead of switching between dozens of platforms, teams can streamline processes and keep work flowing smoothly. The system’s toolkit approach means you can design once and deploy anywhere, saving time and effort. Civic’s SDKs and developer tools make setup possible in minutes, allowing companies to modernize login while enabling intelligent automation. By bringing trust and efficiency together, Civic reduces friction for both end-users and enterprises. It’s a flexible foundation for organizations looking to improve security, productivity, and scalability in one move.

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.

Authgear provides a versatile authentication platform designed to assist businesses in effectively overseeing user management, reducing fraud, easing the burden of password management, and speeding up development timelines. It enables developers to swiftly incorporate various security features such as two-factor authentication, session management, magic links, biometric options, and social login into their applications, all within a matter of minutes. Moreover, Authgear includes an Admin Portal that facilitates the management of user access and sessions, while also allowing for the analysis of event logs, ensuring a comprehensive approach to user security and management. This combination of features not only enhances security but also streamlines the overall user experience.

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.

BotDelive provides a two-factor authentication (2FA) and push notification service through instant messaging bots designed specifically for developers. To get started, simply create an account on BotDelive and obtain your API credentials. Once you have that, you can dive into our API documentation to begin the integration process! You'll find that incorporating 2FA requires just two API endpoints. As a cloud communication platform tailored for developers, BotDelive facilitates the sending and receiving of 2FA and push notifications through popular chat applications using its APIs. Typically, developers are required to compel users to download an app for notifications. However, since chat applications are already present on millions of devices, why not take advantage of them? BotDelive streamlines the 2FA process, allowing users to authorize their accounts simply by responding to yes or no questions. With BotDelive, you can authenticate users more efficiently than using traditional email and password methods; just ask for the password once, and the service will manage all subsequent requests on your behalf. Additionally, you can send crucial push notifications seamlessly through chat applications, ensuring that your communications reach users reliably. By choosing BotDelive, you’re opting for a dependable solution that enhances user experience and security.

Sima offers more than merely blocking unauthorized individuals; it serves as a sophisticated cloud-based Access Control reader that prioritizes both security and user experience. Capable of processing mobile credentials like QR codes alongside facial biometrics, Sima's integrated software can provide either single-factor access through QR codes or multi-factor authentication via facial recognition for enhanced security tailored to specific facility needs. We are committed to safeguarding your privacy rigorously. Our facial recognition technology enables us to authenticate identities effectively, ensuring that access is granted only to verified individuals. The facial data collected is retained solely for identification purposes on our secure servers, and rest assured, your personal information, including images, will remain confidential and will not be disclosed to any third parties. Additionally, we continuously update our security measures to adapt to evolving threats, ensuring that your access remains both secure and seamless.

Aserto empowers developers to create secure applications effortlessly. It simplifies the integration of detailed, policy-driven, real-time access control into applications and APIs. By managing all the complexities associated with secure, scalable, and high-performance access management, Aserto streamlines the process significantly. The platform provides speedy authorization through a local library alongside a centralized control plane to oversee policies, user attributes, relationship data, and decision logs. It is equipped with the necessary tools to implement both Role-Based Access Control (RBAC) and more nuanced authorization frameworks like Attribute-Based Access Control (ABAC) and Relationship-Based Access Control (ReBAC). You can explore our open-source initiatives, such as Topaz.sh, which serves as a standalone authorizer deployable in your infrastructure, enabling fine-grained access control for your applications. Topaz allows the integration of OPA policies with Zanzibar's data model, offering unparalleled flexibility. Another project, OpenPolicyContainers.com (OPCR), enhances the security of OPA policies throughout their lifecycle by enabling tagging and versioning features. These tools collectively enhance the security and efficiency of application development in today's digital landscape.

Customers are requesting features that necessitate a significant refactor, as the existing code is manually crafted, delicate, and difficult to troubleshoot. This code is dispersed across the entire codebase and depends on information from various sources, making it challenging to manage. Currently, there is no centralized view to determine access permissions, verify the effectiveness of authorizations, or understand the reasons behind request approvals or denials. To address this, outline the access permissions within Workbench, our visual rules editor. Begin with fundamental elements for common scenarios such as multi-tenancy and Role-Based Access Control (RBAC). You can then enhance your authorization logic using custom rules in Polar, our specialized configuration language. Additionally, transmit essential authorization information, including roles and permissions, to streamline processes. Replace traditional IF statements and custom SQL with robust authorization checks and filtered lists based on these permissions, thereby improving efficiency and clarity in managing access control. A well-structured system not only simplifies authorization management but also enhances overall security and functionality.

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.

PropelAuth offers seamless integration and intuitive APIs tailored for developers, while also featuring built-in user management that caters to customer-facing teams. Additionally, it provides valuable data and insights designed for product managers and executives. The foundation of PropelAuth is the belief that an exceptional authentication product should effortlessly support your needs. We equip you with essential tools right from the start, enabling you to create secure and seamless experiences for your users. When you begin onboarding users, your team is likely to encounter a comprehensive list of tasks and requirements. In PropelAuth, organizations are treated as a key element, allowing you to utilize our user interfaces for a quick setup or create customized solutions through our APIs. You can either start with our predefined roles or develop your own to suit your preferences. Furthermore, we simplify the process of updating existing users whenever changes are made. Integration with identity providers such as Okta and Azure AD is made straightforward, and we supply guides to assist users in configuring and testing their settings. You can also customize session lengths for each organization, enforce multi-factor authentication, and much more. By managing the complexities of identity management, we allow you to focus on what truly matters. Embrace a hassle-free authentication experience with PropelAuth and enhance your operational efficiency.

ZITADEL serves as an open-source platform for identity and access management, aiming to streamline the processes of authentication and authorization for various applications. It encompasses a robust array of features, including customizable login pages, compatibility with contemporary authentication techniques like Single Sign-On (SSO) and social logins, as well as the implementation of multifactor authentication to bolster security measures. Developers have the option to either integrate ZITADEL’s APIs into their applications for direct authentication or create specialized login interfaces tailored to their needs. Furthermore, the platform's role-based access control mechanism allows for meticulous permission management tailored to specific user roles, and its multi-tenant architecture makes it easy to extend applications to accommodate new organizations. ZITADEL's flexibility not only supports diverse workflows and user management processes but also adheres to brand guidelines, with features such as ZITADEL Actions enabling the execution of workflows triggered by specific events without necessitating further code deployments. As a result, ZITADEL is an adaptable solution for businesses looking to enhance their identity management strategies efficiently.

NextAuth.js is a popular open-source authentication framework specifically designed for Next.js applications, providing smooth integration with well-known services such as Google, Facebook, Auth0, and Apple. It accommodates a range of authentication techniques, which include OAuth 1.0 and 2.0, email and passwordless sign-ins, as well as custom username and password solutions. Built with versatility in mind, NextAuth.js functions effectively in serverless settings and is compatible with various databases like MySQL, PostgreSQL, MSSQL, and MongoDB, giving developers the option to utilize either database sessions or JSON Web Tokens (JWT). To ensure security, it incorporates features like signed and prefixed server-only cookies, HTTP POST with CSRF token checks, and encrypted JWTs that adhere to JWS, JWE, and JWK standards. The framework is designed for quick implementation, allowing developers to integrate authentication features within minutes while requiring minimal configuration. In addition, extensive documentation and an active community contribute to its user-friendliness, making it an excellent choice for developers in search of a reliable authentication solution. Ultimately, NextAuth.js streamlines the integration process, empowering developers to focus more on building their applications rather than getting bogged down in authentication complexities.

Auth.js is a library for authentication that is open-source and crafted to work effortlessly with contemporary JavaScript frameworks, delivering a secure and adaptable authentication process. It accommodates a range of authentication techniques, such as OAuth options like Google and GitHub, traditional credentials, and WebAuthn, enabling developers to select the best-fitting method for their projects. This library is compatible with various frameworks, including Next.js, SvelteKit, Express, Qwik, and SolidStart, which allows for the implementation of authentication across diverse platforms. Additionally, Auth.js comes with built-in integration for widely-used databases like Prisma, Drizzle ORM, Supabase, Firebase, and TypeORM, making user data management straightforward. To ensure the safety of user information, it features security measures such as signed cookies, validation of CSRF tokens, and encrypted JSON Web Tokens (JWTs). Furthermore, Auth.js is optimized for performance in serverless settings, and it provides thorough documentation along with examples to assist developers. Overall, its versatility and robustness make Auth.js an excellent choice for building secure authentication systems in a variety of applications.

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.

IdentityServer serves as a versatile and standards-adhering framework for OpenID Connect and OAuth 2.0 tailored for ASP.NET Core, ensuring complete control over user interface, user experience, business logic, and data management. It has received official certification from the OpenID Foundation and encompasses a wide array of protocols and standards developed by the OpenID Foundation and IETF working groups. Additionally, it presents limitless hosting possibilities, facilitating deployment on-premises, in cloud environments, behind VPNs, and on various platforms such as Windows, Linux, Docker, or Kubernetes. Duende Software enhances this offering with supplementary products, including IdentityServer for Redistribution and a Backend for Frontend (BFF) security framework. To assist developers in effectively utilizing these solutions, extensive documentation and training resources are readily accessible. Our commitment to being fully compliant with standards is paramount, and we strive to provide you with comprehensive access to all facets of the OAuth and OpenID Connect protocol family. Furthermore, this approach empowers organizations to implement secure authentication and authorization processes tailored to their specific needs.

FreeRADIUS is a robust, highly efficient, and modular open-source RADIUS solution that encompasses a server, client library, development libraries, and a variety of additional tools. It stands as the most widely utilized RADIUS server worldwide, serving as the backbone for prominent Internet Service Providers and telecom companies, and is instrumental in powering eduroam, the global Wi-Fi roaming service for educational institutions. This software boasts support for a diverse array of authentication protocols, which include PAP, CHAP, and all types of EAP, such as EAP-TLS, EAP-TTLS, and EAP-PEAP with EAP-MSCHAP. Its modular architecture facilitates adaptable configurations, allowing for conditional processing of requests, integration with LDAP and SQL databases, and the ability to run external scripts. The support for virtual servers simplifies intricate implementations while also minimizing maintenance expenses. Additionally, FreeRADIUS accommodates more than 100 vendor-specific attributes, guaranteeing compatibility with numerous network access servers and contributing to its widespread adoption in various settings.

Proton Authenticator is a privacy-centric two-factor authentication application that creates time-based one-time passwords, enhancing the security of online accounts by providing an additional layer beyond mere passwords, thereby enabling users to safeguard their accounts across multiple devices. Being open-source and employing end-to-end encryption, it ensures that all cryptographic processes and secret keys are handled locally, so even the developers at Proton cannot access your unencrypted 2FA information, thus prioritizing transparency and robust privacy by design. Users have the ability to sync their 2FA codes across different devices through encrypted backups, including options like iCloud or a Proton Account, as well as import codes from other authenticator applications and export them if necessary, which offers flexibility and autonomy over their 2FA credentials without being tied to a single vendor. Moreover, Proton Authenticator is completely free, devoid of any ads or tracking, and incorporates secure functionalities such as biometric locks and offline access, allowing users to generate login codes whenever needed, even without an internet connection. This makes it an ideal choice for those who prioritize security while managing their online accounts effectively.

Ente Auth is a free and open-source app designed for two-factor authentication, enabling users to create and manage time-based one-time passwords that enhance security beyond standard password protection. With features such as end-to-end encrypted backups, users can safeguard their codes without the risk of losing them, ensuring that their information remains confidential, even from the service provider. The app offers seamless synchronization of codes across mobile, desktop, and web platforms through secure encrypted channels, and it also allows users to import existing 2FA tokens easily by scanning QR codes or through manual input. Additionally, users can benefit from functionalities like offline code generation, tagging and searching for codes, pinning favorites, and a quick display of the next code for expedited logins. All backups utilize robust, audited cryptography, ensuring that only the user has the keys to access their 2FA secrets, and there is an option to share codes securely with colleagues through encrypted links that can be set to expire. Furthermore, Ente Auth is designed to enhance user experience by providing a clean interface and intuitive navigation, making it accessible for everyone, regardless of their technical background.

Aegis Authenticator is a free, secure, open-source application for Android that facilitates the management of two-factor authentication tokens, enabling users to enhance the security of their online accounts by producing time-based or HMAC-based one-time codes (HOTP/TOTP) compatible with countless services that implement industry-standard 2FA, positioning it as a privacy-conscious alternative to popular apps such as Google Authenticator or Authy. The application securely stores tokens in a locally encrypted vault, accessible through a robust password and optionally through device biometrics, and it offers a range of features including encrypted backups, QR-code scanning, manual entry, and the ability to import/export credentials from other authenticator applications, allowing for a seamless and secure migration of existing 2FA settings. Aegis also boasts comprehensive organizational tools such as customizable icons, grouping options, alphabetical and custom sorting methods, along with a search function, ensuring users can efficiently manage multiple accounts, while its user interface prioritizes both security and privacy. Additionally, the app's commitment to open-source principles fosters community trust and allows for transparency in its security practices.

2FAS is a robust platform for password management and two-factor authentication that prominently features its open-source 2FAS Authenticator application. This app empowers users to enhance their login security by generating both time-based and event-based one-time codes that refresh regularly, effectively shielding online accounts from unauthorized access. As a result, it simplifies the security process for various services, including email, social media, financial accounts, and more that utilize 2FA. The platform prides itself on being user-friendly, private, and secure; it operates offline and abstains from storing passwords or any usage data, eliminating the need for user account creation and allowing for anonymous usage. Furthermore, 2FAS offers the convenience of syncing codes across multiple mobile devices through encrypted backups, along with biometric or PIN protection. Users can also import and export authentication seeds, ensuring they maintain control over their data and can easily transition between devices or applications whenever necessary. This blend of security and usability makes 2FAS an appealing choice for those seeking to safeguard their digital identities.