Best Free Authentication Software of 2025

Frontegg is a modern Customer Identity and Access Management (CIAM) platform purpose-built for SaaS applications. It gives developers a robust, low-code toolkit to implement advanced identity features like multi-factor authentication (MFA), single sign-on (SSO), passwordless login, and role-based access control (RBAC) without spending weeks wiring up custom flows. Designed with developers in mind, Frontegg supports rapid integration via SDKs and APIs for Node.js, React, Python, and more. It includes built-in support for OpenID Connect, SAML, OAuth2, and Webhooks, and ships with pre-configured components for login, signup, user management, and organization hierarchies. Whether you're building multi-tenant apps, complex subscription logic, or entitlement enforcement, Frontegg scales with you. Beyond the initial integration, Frontegg offloads identity maintenance from engineering by enabling non-technical teams to manage identity-related tasks through a secure admin portal. Product, Infosec, and Customer Success teams can enforce security policies, manage users, configure auth flows, and respond to customer needs without dev involvement. Security teams can monitor and enforce identity compliance standards through real-time dashboards and built-in audit trails. Frontegg also ensures continuous updates to identity protocols, so developers don't have to worry about chasing evolving standards. Frontegg reduces developer toil, shortens go-to-market timelines, and keeps engineering focused on high-impact product work. All while maintaining the security, scalability, and flexibility required by modern SaaS platforms.

Auth0 takes a modern approach to Identity and enables organizations to provide secure access to any application, for any user. Auth0 is highly customizable, and simple yet flexible. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation. With Auth0, you can rapidly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control.

Plaid is an international data network that powers tools used by millions of people to live a more healthy financial life. Our ambition is to facilitate an inclusive, competitive and mutually beneficial financial systems by simplifying payments and revolutionizing lending. Plaid works with more than 8,000 companies, including fintechs such as Venmo and SoFi and several Fortune 500 companies, to give people more control and choice over how they manage money. Plaid is headquartered in San Francisco and its network spans more than 12,000 institutions throughout the US, Canada UK and Europe.

FusionAuth offers a robust authentication solution that prioritizes flexibility, security, and ease of use for developers. It accommodates various authentication methods, including traditional username/password, passwordless options, multi-factor authentication (MFA), and social login integrations. With an API-first design, FusionAuth seamlessly integrates with any technology stack or architecture. It adheres to industry standards by supporting protocols like OAuth2, OIDC, and SAML, ensuring secure and compliant authentication processes. Whether you choose to deploy it on-premises, in the cloud, or in a hybrid setup, FusionAuth empowers you to manage the user login experience effectively while also aiding in compliance with regulations such as GDPR, HIPAA, and COPPA.

Veriam redefines authentication by integrating identity management, access control, and subscription oversight into one comprehensive and secure platform. In contrast to conventional authentication methods, Veriam’s unified system streamlines administrative tasks, minimizes the number of required tools, and enhances the overall experience for both users and service providers. With Veriam, users can access various products, subscriptions, and data from any participating organization using just a single login—boosting security while simplifying the login process. Notable Features: ✔️ Single Sign-On (SSO): Enjoy secure and adaptable logins through Google, Microsoft, or email. ✔️ Role-Based Access Control: Grant access based on user roles and specific needs. ✔️ User Invitations & Onboarding: Seamlessly onboard new users by automatically placing them in the appropriate teams via email invitations. ✔️ Profile & Data Management: Users can easily control their profiles, access levels, and data preferences. ✔️ Security & Compliance: Veriam adheres to industry standards, ensuring the security and privacy of your data. Experience the difference today!

Protect your users. Make their journey easier. MIRACL Trust provides a safer and smoother authentication experience. Only one step. No passwords. No problem. Multi-factor authentication is slow and cumbersome. MIRACL is a safer and more efficient alternative to traditional MFA. Logging in takes only 2 seconds and error rates as low at 1/10th of passwords. No passwords necessary. All you need is a PIN and you are in. Our cryptographic technology ensures that users' information is always safe. MIRACL Trust provides a simple login experience that puts users first and makes it easy to roll out your data quickly.

You can harness the power of biometrics to make authentication simple for any website or application. This will allow you to create a new way to log in and authenticate online. You can authenticate your users using their smartphones with 2-factor and passwordless authentication. Auth Armor provides secure authentication for every user. It does not require weak passwords or complicated codes. We have created powerful APIs, SDKs and libraries that allow you to create what you want, however you want it. You can use our tools to add authentication to any app using any flow. We offer protection for workers and consumers, so you have the power and flexibility you need to secure any information. Auth Armor is the most efficient mobile authentication system available. Instant push messaging is available to users' devices, enabling them to log in and authenticate quickly.

Passwordless, proximity login to desktop applications, Macs, PCs, Macs, websites and Macs. Active proximity-detection allows hands-free wireless 2FA and password management. IT administrators can allow users to log into their computers and websites dynamically using a physical key. This can be done either automatically, manually, by touch, pressing Enter, or with an PIN. You can easily log in, switch users, change computers, and log out without any passwords, touch, trouble, or hassle - all you need is a key. The computer locks automatically when a user leaves, preventing access to the computer or web passwords. Continuous authentication ensures that users are constantly being checked to make sure they have access. No more typing passwords. Administrators and compliance can now automate password protection from a central admin console. This allows them to enforce stronger passwords and 2FA and gives employees the ability to log in without having to interrupt their workflow. Helpdesk tickets for forgotten passwords/password resets will be reduced. Login and autolock with proximity

Google Authenticator produces 2-Step Verification codes directly on your mobile device. This additional layer of security enhances the protection of your Google Account by necessitating a second verification step during the login process. Alongside your password, you will need a code that the Google Authenticator app generates on your phone. By using your Google Account, you can conveniently and securely access a multitude of websites and services, while also maintaining clear control over your privacy preferences. To further safeguard your account, utilize the Security Checkup tool, which offers tailored advice and actionable steps to bolster your account's security. It's crucial to understand that compromised passwords are far more prevalent than one might assume. Two-step verification serves as a formidable defense against unauthorized access, requiring that you complete an additional verification step after entering your password, thus significantly enhancing your account's safety. With this method, you can have greater peace of mind knowing that your information is better protected.

Secure your workforce with powerful, simple access security. We are Cisco Duo. Our modern access security system is designed to protect all users, devices, applications, so you can focus on what you do best. Secure access for all users and devices, in any environment, from any location. You will enjoy the peace of mind that only total device visibility and trust can provide. A SaaS solution that natively protects all applications and is easy to deploy, scaleable and quick to respond to threats. Duo's access security protects all applications from compromised credentials and devices. It also provides comprehensive coverage that helps you meet compliance requirements. Duo integrates natively with applications to provide flexible, user friendly security that is easy to implement and manage. It's a win-win-win for administrators, users, and IT staff. Multi-factor authentication, dynamic device trust and adaptive authentication are key components of your zero-trust journey. Secure SSO is also a part of the mix.

LastPass is the leader in password and identity management solutions, trusted by individuals and organizations of all sizes worldwide. Millions rely on LastPass daily to create, store, manage, and protect their most important credentials, keeping them secure, private and always within reach. With LastPass, anyone can effortlessly log in to life or work anytime, anywhere.

Embrace a password-free experience by simply entering your username and verifying your sign-in through your mobile device—it's as straightforward as that! Traditional passwords can easily be forgotten, intercepted, or hacked, but with the Authenticator app, your phone adds an additional security measure alongside your PIN or fingerprint. This tool enables you to log into services like Outlook, OneDrive, Office, and many others seamlessly. Safeguard all of your accounts with the added protection of two-step verification. Furthermore, the app enhances your online security by employing industry-standard time-based one-time password (OTP) codes for comprehensive account protection. By utilizing these features, you can enjoy a more secure digital experience without the hassle of remembering complex passwords.

Protectimus SAAS two factor authentication service is already in the cloud and accessible 24/7. Register and start the integration via API, or a ready-made plugin. Protectimus On Premise MFA platform is available on your premises or in a private cloud. Radius, Citrix netScaler, XenApp VMWare and Active Directory, LDAP and Windows Logon and OWA, RoundCube and Dynamic Passwords, API and SDK, customized individual and development. Dynamic Strong Password authentication integrates directly to Microsoft Active Directory (or any user directory) to add six-digit passwords to users' static passwords. Today, data violation happens regularly. Strong authentication methods are essential if you want to ensure that your data is fully protected. Personal information is likely to be displayed without any external intervention. However, when it comes to business, we wouldn't limit user authentication or identification to a single password.

Rublon allows your workforce to securely connect to your organization's servers, networks, and applications. Multi-factor authentication makes it easy to protect your data and comply with data protection regulations such as GDPR. Rublon can be deployed across your organization, enabling multi-factor authentication (MFA) for all cloud apps, VPNs servers, workstations, on-premise and internal apps.

It makes it easier for employees and students to access the apps they need to learn or work. Students and employees can reset their passwords at any time, which reduces the need for IT help. Increases cyber security by protecting user accounts against hacking and thwarting ransomware, phishing cyber attacks.

Finally, a password manager that is designed for collaboration. Secure, flexible, and ready for automation. Trusted by over 10,000 organizations, including Fortune 500 companies and newspapers as well as governments and military forces. Passbolt servers have been designed to be easy to set up and manage. They are enterprise-ready and can be configured to support high availability. Passbolt is available via your browser or your mobile phone. Real-time sharing is possible. Desktop apps are on the horizon. The JSON API allows you to retrieve, store, and share passwords programmatically. Automate at scale using Passbolt CLI Access logs in real-time. Privacy is part of our DNA, and also in the DNA European laws (to ensure we don't change minds). Passbolt's self-hosted source code is covered by an AGPL license. Yes, even the commercial version. It is free to be audited, contributed to, and redistributed. This is why we have thousands of organizations from all sectors.

Protect essential organizational data and enhance employee efficiency with OneLogin, a reliable identity and access management (IAM) platform tailored for contemporary businesses. This solution is crafted to bolster security within enterprises while streamlining login processes, making it an ideal choice for organizations aiming to implement security measures effortlessly. OneLogin boasts a variety of highly-rated functionalities, including single sign-on (SSO), a centralized directory, user provisioning, adaptive authentication, mobile identity management, compliance reporting, and additional features. By leveraging these tools, companies can ensure both security and ease of access for their users. As organizations continue to navigate the complexities of digital security, OneLogin stands out as a comprehensive solution to meet these evolving needs.

Identity Governance and Web Access Management You must ensure that new employees are granted access to all systems and resources necessary to their work. Access that is not necessary for the new position must also be revoked. It is essential that permissions are granted for users who leave the firm or are terminated. To avoid disgruntled users, access to sensitive data and applications must be disabled or removed promptly with traceability.

Cyphercor is a two factor authentication provider that offers a best-in-class solution that's effortless, intuitive, and cost-effective called "LoginTC". LoginTC adds an additional layer of security to your systems and applications including VPNs, Firewalls, remote desktop, active directory, and more. LoginTC offers a wide range of two factor options for end-users to authenticate, including SMS, email, push notifications, hardware tokens, U2F, OTP, bypass codes, and more. LoginTC can help you reduce your insurance costs and meet compliance regulations with ease.

Aerobase is a publicly available Identity and Access Management (IAM) system that focuses on various aspects such as identity federation, single sign-on (SSO), robust and adaptive authentication methods, access management, account oversight, identity provisioning, as well as securing APIs and microservices in line with privacy regulations. This introductory guide is designed to assist you in setting up Aerobase, detailing server setup and the utilization of the default database. However, it does not delve into more advanced deployment methods. For additional insights into features or configuration settings, please refer to the supplementary reference materials available. Understanding these aspects will enhance your overall experience with Aerobase.

OpenOTP Security Suite is an enterprise-class security solution for two-factor authentication with U2F/OTP, federation and identity management (IAM). The solution combines mobile technologies with proven security standards to provide the best alternative for business and non-business users who need cost-effective solutions that support their users' mobility. It enables integration of a variety of third-party products and systems with MFA, even if they only support LDAP as an authentication backend. Try OpenOTP Security Suite if you are interested in: USER MOBILITY | PRIVACY | VPN AND WIFI SECURITY | SSO AND ADFS | FINE-GRAINED AUTHENTICATION POLICIES | ALL-IN-ONE SECURITY SOLUTIONS | EUROPEAN DATA STORAGE OpenOTP Security Suite is an enterprise-class European security solution designed for installation on-premises or in a private cloud. ++ Free Token App (and compatible with most existing hardware and software tokens) ++ Free 30-day Trial ++ Freeware (<25 users)

HYPR is The True Passwordless Company with cutting edge technology and backed up by major investment partners. The HYPR Cloud Platform allows Passwordless Authentication across an enterprise workforce. It combines the security and convenience of a smartcard with the convenience of a smartphone. With HYPR, businesses can eliminate customer passwords and provide a superior login experiences for your customers as well. Consumer-grade usability increases the productivity of your employees and reduces friction for your customers.

Managing password security in Active Directory can be challenging, but it doesn’t have to be. Enzoic makes it easy with automated, always-on protection that works quietly in the background. Designed for IT professionals, it delivers smarter security without adding unnecessary complexity. - Always-On Monitoring: Passwords and credentials are automatically protected 24/7—no manual effort required. - Real-Time Breach Defense: Daily updates block compromised passwords before they pose a risk. - Comprehensive Coverage: Protects not just passwords but entire credential sets to reduce vulnerabilities. - Block Weak Passwords: Prevents predictable options like "Password123" while guiding users to create stronger alternatives. - Effortless Compliance: Achieve NIST 800-63B compliance with built-in protections and policies. - User-Friendly Tools: An optional Windows client provides real-time feedback to users, reducing IT workload. Cutting-Edge Threat Intelligence: With billions of compromised passwords updated daily, Enzoic protects your systems from new and old breaches alike. Built for IT, Designed for Simplicity: Enzoic integrates seamlessly into your environment, eliminating unsafe passwords and improving security.

LoginID's SKDs and APIs allow sites and apps to easily integrate our FIDO/FIDO2-certified multi-factor authentication solution. By leveraging the native biometrics on the end user's device, our platform creates a private/public key pair that enables strong customer authentication. The end user does not need to install any additional apps and the private key never leaves the secure area of their device. LoginID's transaction confirmation service is perfect for online merchants because it prompts a biometric action for each transaction which is then cryptographically signed. We are in alignment with PSD2, GDPR, CCPA, and HIPPA standards. LoginID has SDKs for iOS, Android, React-Native, Web, Python, Java, and Node as well as a WordPress Plugin.

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.