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.

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.

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.

Appwrite is an open-source platform for building scalable applications. It comes with authentication, databases, storage, and functions. It's basically a complete development platform. They have an extremely generous free plan with 75,000 MAUs free of charge and their Pro plan is only $15/month. Appwrite offers email and password login, phone auth, magic links, email OTP, anonymous login, JWT login, SSR login, custom tokens, and two-factor authentication.

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.

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.

Your eCom Agent is an AI-powered toolset designed to save Amazon sellers time and improve their business with quick, actionable insights. Analyze competitors, optimize listings, and streamline your workflow in minutes. Try it free with a 7-day trial. Key Features: - Product Development: Analyze competitors to identify key features and solutions to customer issues. - Review Analyzer: Summarize any ASIN's reviews into Pros, Cons, and insights. - Bundle & Add-On Ideas: Generate ideas to enhance your product offerings. - Brand Developer: Create a unique brand identity. - Product Ideation: Discover new product ideas. - Listing Fixer: Get personalized recommendations to optimize your listings. Benefits: - Automated Workflows: Efficiently manage tasks with AI-powered automation. - Creative Solutions: Find opportunities you may have overlooked. - Save Time: Complete tasks in minutes, saving you hours. How It Works: For all the tools all you need to do is provide product ASINs and optional additional text and click run. The AI will automatically do the rest of the work for you.

GOSH.app is a free AI Powered Price Tracking Tool and Price Tracking Chrome Extension. Track product prices and stock levels at any store, anywhere using the magic of AI. Get instant alerts when prices drop, or the product comes back into stock. Key Features - Get instant email or push notifications on product discounts. - Get instant email or push notifications on product re-stocks. - Install our free GOSH Price Tracking Chrome Extension (to quickly track the price of products from any store anywhere). Benefits - AI Powered Price Tracking: Never pay full price on a product again. - AI Powered Stock Level Tracking: Get access to the new stock before it sells out. - Free Price Tacker: Save big $$$ on products you buy often. Use Case Track product prices and stock levels at any store, anywhere. Get instant alerts when prices drop, or the product comes back into stock.

At PopaDex we've designed a net worth tracker that's more than just a tool – it's your personal financial canvas. Whether you're planning for retirement, investing in property, or saving for a dream holiday, PopaDex makes complex financial planning simple and accessible.

PostPuma is a social media management platform powered by AI, designed to streamline and enhance how businesses maintain their online presence. From effortlessly scheduling posts to delivering AI-driven recommendations that optimize content and analyze performance, PostPuma equips users with the tools they need to manage social media effectively and efficiently. Ideal for small to medium-sized businesses, marketing teams, and content creators, it’s a solution tailored to save time, boost organization, and grow audiences. The platform’s standout features include a centralized content scheduler that lets users plan posts across multiple social media platforms from one intuitive dashboard. AI-driven content optimization offers tailored suggestions to refine tone, style, and content ideas for maximum audience appeal. Meanwhile, performance analytics provide actionable insights into audience behavior, enabling users to fine-tune strategies for better results. For teams, PostPuma supports smooth collaboration with role assignments and built-in approval workflows. Additionally, multi-platform integration ensures every account is seamlessly managed in one place. The benefits of PostPuma are clear: automate time-consuming tasks, maintain consistent posting schedules to enhance engagement, and make data-driven decisions with easy-to-read analytics. The platform’s user-friendly design ensures accessibility for beginners while offering advanced tools for experienced marketers. Teams especially benefit from streamlined collaboration, avoiding the confusion of disjointed workflows. Getting started is straightforward—connect your social media accounts to PostPuma, and the platform’s AI tools take it from there. You can generate or refine posts, schedule them to align with peak engagement times, and monitor their performance using the analytics dashboard. Teams can collaborate effortlessly, ensuring a unified approach to content creation and publishing.

Track, analyze, and explore TikTok, Insta Reels, and YouTube Shorts videos and accounts. Monitor your accounts across platforms and dive into viral content like never before. Access advanced data analysis and dashboards to keep track of your videos and identify outliers, creating a virality machine for your app or brand. Use AI to search through an extensive library of viral content. Search by context and hook to find the latest high-performing videos and get inspiration for your next short content. Discover similar viral videos to your own to enhance your content, and find accounts that mirror yours. Spy on and track your competition, uncover their viral content, and improve your own content strategy.

Tools.so is a directory of high quality tools from all over the internet. Some examples include Notion, Prisma, Mixpanel, Render and Betalist.