The best authentication & identity tools in 2025
What are authentication & identity tools?
Authentication and identity tools are software solutions that verify and manage user credentials to ensure secure access to digital platforms. These tools include methods like passwords, biometrics, and multi-factor authentication to authenticate users and protect sensitive data. They also handle user identity management, enabling businesses to control and monitor user access across various systems and applications.
Firebase
—An app development platform backed by Google
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An app development platform that helps you build and grow apps and games users love. Backed by Google and trusted by millions of businesses around the world.
Clerk
—An authentication and user management platform
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A complete suite of embeddable UIs, flexible APIs, and admin dashboards to authenticate and manage your users.
Auth0
—Secure access for everyone. But not just anyone.
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Whether you’re a developer looking to innovate or a security professional looking to mitigate, we make identity work for everyone. Auth0 is the solution you need for web, mobile, IoT, and internal applications. Loved by developers and trusted by enterprises.
Appwrite
—Build like a team of hundreds
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A secure open-source backend server provides the core APIs required to build web and mobile applications. Appwrite provides authentication, database, storage, functions, messaging, and advanced realtime capabilities.
PropelAuth
—Authentication that works before you write any code
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PropelAuth hosts and manages your authentication. Features like social logins, magic links, or managing profile pictures can be added in a single click. With our B2B support, your users can create organizations and invite their team members out of the box.
Keycloak
—Open Source Identity and Access Management
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ApparenceKit
—Ship your mobile app in days, not months
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ApparenceKit is a complete flutter boilerplate to help you ship a successful app on Android and iOS. Subscription, Notififications, Auth, Ads, translations, Architecture, Deployment....
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Composio AgentAuth enables developers to build agents that securely interact with external applications on behalf of users. With comprehensive auth management across multiple mechanisms like OAuth, ApiKey, etc, your agents can connect to over 250 ready-to-use tools and integrations—including Gmail, Slack, Calendar, and HubSpot—to automate real-world tasks effortlessly. Get started now with our Python and JS SDKs and bring your AI agents to life.
Recognito Identity Verification SDKs
—NIST FRVT Top #1 Face Recognition Algorithm Developer- Overview
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Recognito is a global leader in Face Biometric and ID Document Verification SDKs for Identity Verification Solutions. We offer on-premise Face Recognition, Liveness Detection and ID Document Recognition, Liveness Detection SDKs for server and mobile. Try out our product online: https://recognito.vision/face-biometric-playground/ https://recognito.vision/id-document-verification-playground/
