The biggest advantage of Cognito is that it's a part of the AWS ecosystem and integrates well with other AWS services. The free tier comes with 50,000 MAUs and the price for each additional MAU starts at $0.0055/month and goes down to as low as $0.0025/month as you scale to tens of millions of users. It integrated with four federated identity providers - your users can sign up with Facebook, Google, Apple and Amazon.

Google's Firebase is an entire app development platform that's packed with features.It comes with storage, cloud functions, monitoring and, of course, user authentication. The free tier comes with 50,000 MAUs. Beyond that pricing start at $0.0055/MAU and goes down to as low as $0.0025/MAU as you scale to millions of users. Firebase authentication supports email and password auth, phone auth, magic links, two-factor authentication and social identity providers - mainly Google, Google Play Games, Facebook, Apple, Microsoft, Twitter, GitHub and OAuth access tokens.

Auth0 is an identity and access management (IAM) platform designed to simplify authentication and authorization for applications. It provides a flexible solution that allows developers to implement secure login systems without having to build them from the ground up. Auth0 supports various authentication methods, including username-password credentials, social logins (like Google, Facebook, and GitHub), enterprise identity providers (such as Active Directory and SAML-based systems), and passwordless options. The platform is highly adaptable, offering over 30 software development kits (SDKs) that cater to a wide range of languages and frameworks—JavaScript, Python, .NET, iOS, Android, and more. This makes integration straightforward regardless of the tech stack. Beyond basic authentication, Auth0 offers advanced features like multi-factor authentication (MFA), single sign-on (SSO), and fine-grained authorization. These tools enable organizations to enforce complex access control policies, supporting both role-based (RBAC) and attribute-based (ABAC) models. Auth0 also addresses enterprise needs through features like user provisioning, directory synchronization, and support for B2B, B2C, and B2E use cases. It’s designed with scalability in mind, making it suitable for both startups and large enterprises. The platform’s extensibility allows developers to customize authentication flows, implement rules for conditional access, and integrate third-party services. Since its acquisition by Okta, Auth0 operates as a product unit under the Okta umbrella, complementing Okta’s broader suite of identity solutions while maintaining a developer-first focus. This combination brings together Okta’s enterprise-grade security with Auth0’s developer-centric approach, offering a comprehensive solution for modern identity challenges.

Clerk is a comprehensive user management and authentication platform designed to streamline how developers handle user accounts within web and mobile applications. It offers a suite of embeddable UI components—such as <SignIn/>, <SignUp/>, <UserButton/>, and <UserProfile/>—that integrate seamlessly into your application without redirecting users off-site. These components are fully customizable to match your brand, making the user experience cohesive and frictionless. Under the hood, Clerk provides a robust API and SDKs compatible with modern frameworks like Next.js, Remix, React, and Expo. It handles the entire authentication lifecycle, supporting multifactor authentication (MFA), session management, passwordless sign-in (via magic links or one-time passcodes), and traditional password-based methods with breach detection. The platform also integrates social sign-on (SSO) with over 20 providers, enabling quick user onboarding while adhering to security best practices. Clerk’s security posture includes SOC 2 Type 2 certification and CCPA compliance, with continuous third-party audits and penetration testing. Fraud prevention measures, like disposable email blocking and bot detection powered by machine learning, are built-in to reduce spam and abusive sign-ups. For B2B SaaS applications, Clerk provides advanced multi-tenancy features, enabling organization-based user management with custom roles, permissions, auto-join functionality based on email domains, and invitation systems—all accessible through both code and an admin dashboard. Developers benefit from rapid integration, significantly reducing the time spent on building authentication systems from scratch. Clerk acts as the single source of truth for user data and integrates seamlessly with popular backend services like Supabase, Firebase, and Convex. With free access for up to 10,000 monthly active users, it’s positioned as a scalable solution that grows with your application’s needs.

Supabase is the open-source alternative to Firebase. Like Firebase, it's a complete app development platform with user authentication, cloud functions, APIs, Postgres database, storage, vector embeddings, and other features. Supabase projects come with PostgreSQL's policy engine for fine-grained user access rules. It has social login integrations with Google, Facebook, GitHub, Azure (Microsoft), Gitlab, Twitter, Discord, and many more. They offer a customizable authentication component for React. Phone login and MFA can be added through third-party SMS providers such as Twilio or Bird. The free tier comes with 50,000 monthly active users. The Pro plan, at $25/month, comes with 100,000 MAUs and $0.00325/MAU beyond that.

Stytch provides a suite of tools designed to simplify authentication, authorization, and security for web and mobile applications. If you're developing an app and need a way for users to log in—whether with passwords, passkeys, or entirely passwordless methods—Stytch offers APIs and SDKs that handle these complexities. Their focus is on making authentication seamless for both developers and end-users while ensuring high security standards. For businesses, particularly B2B SaaS companies, Stytch enables advanced features like multi-tenancy, role-based access control (RBAC), and single sign-on (SSO). They provide an embeddable admin portal, allowing enterprise customers to manage their own authentication configurations, organizational settings, and integrations with identity providers—without constant developer involvement. Stytch places a strong emphasis on scalability and flexibility. Their tools are designed to “just work” across a range of use cases, from simple consumer apps to complex enterprise platforms. Developers can choose how much of the authentication flow they want to control—using pre-built UI components for quick implementation or leveraging headless SDKs and backend APIs for a fully customized experience. Security and fraud prevention are also core to Stytch’s offering. They provide real-time bot detection, device-aware multi-factor authentication, and intelligent rate limiting to protect against credential stuffing and other forms of account abuse. Their infrastructure ensures that login codes and authentication requests are delivered reliably, even when SMS or email providers fail. Stytch supports a broad range of programming languages and frameworks, including Python, Node.js, Java, React, and iOS, making integration into existing tech stacks straightforward. Their platform is designed for developers who want to build secure, user-friendly authentication systems without reinventing the wheel.

Kinde has a generous free plan with up to 10,500 MAU free of charge. Their Pro plan costs $25/month and the price for each additional MAU over 10,500 is $0.0175.

Ory is an API-first identity manager. They offer authentication, analytics, access control, machine-to-machine authentication and more. They have SDKs for the major languages: - Dart - .NET - Elixir - Go - Java - JavaScript - PHP - Python - Ruby - Rust Unfortunately, they don't offer a free tier. Pricing starts at $29/month and includes 1,000 daily active users. Then it's $30 / 1,000 additional DAUs.

Formerly known as NextAuth. It's is an open-source authentication library originally built for NextJS. Auth.js is free to use and comes with over 80 integrations for various third-party identity providers such as Google, Facebook, Auth0, Apple etc. You can use it with your own database if you choose to. It works with MySQL, Postgres, MSSQL and MongoDB. Auth.js is compatible with Next.js, SvelteKit and SolidStart as of March 2024.

Gluu offers various authentication solutions based on open-source software. There is a self-hosted solution, a managed solution, and a free fully open-source solution based on the Linux Foundation Janssen Project.

Lucia is an open source auth library that abstracts away the complexity of handling sessions. It works with any JS runtime - Node.js, Bun, Deno, Cloudflare Workers. It's also fully typed. It integrates with MongoDB. PostgreSQL, MySQL, SQLite, and with their respective ORMs and query builders.

GoPasswordless is an authentication service and SDK that focuses on enabling passwordless authentication flows in web apps.

Authenticate customers with WhatsApp, SMS, Email, Biometrics, and more, with a 98% conversion rate on signup and sign-in.

CasperPractice helps aspiring health students prepare for the Casper test for a fraction of the cost of tutoring. It uses AI to generate practice questions and review students' answers, including video answers. Key Features - Question bank: 150+ realistic Casper-style questions - Question simulator: an environment that simulates a real Casper question, including a timer. - Answer reviews: detailed feedback and a grade on the student's submitted answer. Benefits - Effective preparation: students can prepare effectively, increasing their chances of getting a good score on the Casper test. - Affordable: CasperPractice is a fraction of the cost of traditional tutoring. Use Case A student would use CasperPractice to help them prepare for the Casper test.

Lexawise.com it's a real estate exam prep with an AI Chat Tutor –one of the many features you can find in the plataform– crafted by real estate experts to answer all your exam-doubts and optimize your study process in successfully become a real estate professional and pass the exam on your first try

AIPresentationMakers is a specialized review site dedicated to AI presentation tools. AIPresentationMaker offers: Comprehensive, hands-on reviews of every AI presentation tools An expert editorial team composed of professional designers and developers Tutorials, tips and tricks, and coupon codes for getting started with AI presentation tools The site's goal is to make it easy to understand how various AI products work and identify which products are the best fit for different types of users. All of the site’s content is based on the team’s expertise in both slide-making, as well as AI. The editorial team tests each product using real-world prompts and examples to provide the most representative set of scenarios on which to measure the applications.

Decopy AI offers a comprehensive platform for detecting AI-generated content in both text and images, as well as verifying the origins of visuals. Key Features 1. AI Content Detector: Identifies whether text is written by AI or humans. 2. AI Image Detector: Detects AI-manipulated images. 3. Reverse Image Search: Finds the original source of an image across the web. Benefits - All of Decopy AI’s powerful detection tools are completely free to use. No subscriptions, no hidden fees—everyone can access and benefit from our AI Content Detector, AI Image Detector, and other tools at zero cost. - AI Detector tools are built on advanced algorithms that provide exceptional accuracy in identifying AI-generated content and images. Whether you’re analyzing text or visuals, Decopy AI delivers reliable results that you can trust. Use Case - Educators verify student submissions for AI-generated work. - Businesses check content authenticity for marketing. - Researchers trace image origins for verification. - Content creators prevent unauthorized use of their visuals.

NowKnow helps you get market research done in hours instead of weeks. Ask questions, upload designs, and get thoughtful feedback from AI personas that represent your target audience. Key Features - Fast Results: Get detailed feedback within hours instead of waiting weeks for traditional surveys - Realistic Feedback: AI personas provide authentic responses based on real demographic profiles - Visual Testing: Upload images and designs to get feedback on everything from logos to interfaces - No Privacy Concerns: Since responses come from AI personas, there's no GDPR/CCPA compliance needed Benefits - Test More Ideas: Run multiple studies quickly and affordably - Iterate Freely: Adjust your questions and run new versions instantly - Target Precisely: Get feedback from specific demographic groups - Move Faster: Make informed decisions without long research delays Use Case Test everything from marketing messages to visual designs. Perfect for comparing UI layouts, A/B testing ads, getting feedback on logos, evaluating product mockups, and choosing the best social media content.

AI Tools Explorer is a 100% human-curated and edited directory of top-quality, SFW AI tools and apps, organized by category and updated daily with helpful AI guides and resources.

These days, AI directories are popping up all over the place. You’ve got huge lists—like that GitHub one —best-of-ai/ai-directories—and tons of sites trying to round up every AI tool under the sun. It’s a lot, right? Problem is, most of them are packed with meh tools. You dig through glitchy apps or overhyped stuff that doesn’t even work, and it’s a total time suck. Marketers like us? We don’t have time for that—we need tools that actually deliver. That’s where There’s an AI comes in. It’s not like those other messy directories. This one’s all about the good stuff—think of it like a stash of hidden gems, no junk allowed. You can navigate easily on different categories in it, jumping from content tools to ad optimizers without breaking a sweat. And the search? Oh, it’s clutch. You can type in whatever you want, and it pulls up only the best—no shitty tools clogging up your screen.