Open-source alternatives offer extensive customization through public code access. Most of them provide free / paid cloud service. Some might require self-hosting to use.
A developer-focused backend-as-a-service (BaaS) solution providing core APIs for authentication, database, file storage, and server-side functions
Appwrite is an open-source BaaS designed to help developers manage core backend functions such as user authentication, database management, and file storage without needing to set up extensive infrastructure. Built for both web and mobile applications, Appwrite supports a variety of front-end technologies and offers a self-hosted environment for greater data control. Its modular, RESTful API architecture allows developers to efficiently integrate key backend functionalities, making it easier to create robust, scalable applications.
A simple yet powerful open-source BaaS solution that combines a real-time database, user authentication, and file storage into a single package for rapid application development
PocketBase is an open-source backend-as-a-service (BaaS) designed to facilitate fast application development with minimal overhead. It provides a real-time database, user authentication, and file storage, allowing developers to focus on building their applications without the complexities of traditional backend management. With its lightweight architecture, PocketBase can be easily deployed on any server, offering flexibility and scalability for various projects.
A flexible, scalable, and developer-friendly backend platform that simplifies application development by providing robust server-side infrastructure and data management
Parse is an open-source backend framework that enables developers to rapidly build and deploy mobile and web applications by providing a comprehensive set of server-side services. It abstracts complex backend development tasks, offering easy-to-use data storage, user authentication, and cloud function capabilities.
A flexible platform providing single sign-on and multi-factor authentication to enhance security for web applications
Authelia is a robust open-source authentication and authorization server designed for identity and access management (IAM). It provides single sign-on (SSO) capabilities and multi-factor authentication (MFA) for secure access to applications, all while integrating seamlessly with common reverse proxies.
A flexible platform for centralized access management, supporting SSO, MFA, and various authentication protocols
Authentik is a powerful identity provider (IdP) and single sign-on (SSO) platform designed to provide secure, centralized access management across environments. It supports multiple authentication standards, including OAuth2, SAML, LDAP, and SCIM, allowing it to integrate seamlessly with various applications. With a user-friendly admin interface, Authentik simplifies user, group, and application management.
A flexible solution for secure single sign-on (SSO) and user authentication, ideal for web applicationsPostgreSQL database, authentication, and real-time capabilities
Keycloak is an open-source identity management platform that enables secure authentication, SSO, and role-based access control (RBAC) across multiple applications. With support for social logins, multi-factor authentication, and customizable login flows, Keycloak centralizes user management, making it easy to secure access without relying on third-party services.
Empower your applications with flexible and secure authentication, authorization, and user management, tailored to meet your organization’s needs.
Ory provides a modern, modular identity and access management (IAM) solution designed for flexibility and scalability. It enables seamless integration with various applications through Single Sign-On (SSO), social logins, and passwordless authentication, all while offering customizable user interfaces and workflows.
A open-source platform enabling secure user authentication and authorization with customizable options for any web or mobile application
SuperTokens provides an open-source, self-hosted authentication solution focused on simplicity and scalability. It supports common authentication methods, including passwordless login, social login, and single sign-on (SSO), and integrates easily with existing applications. Designed to prevent vulnerabilities, SuperTokens offers comprehensive attack protection and ensures secure user access.
A versatile solution enabling developers to implement secure, passwordless authentication using passkeys, alongside support for email passcodes and optional passwords
Hanko is an open-source authentication and user management system that emphasizes modern, secure login methods. It facilitates the integration of passkeys—an advanced, passwordless authentication technology—into applications, enhancing both security and user experience. Additionally, Hanko supports email passcodes and offers optional password integration, catering to diverse security requirements.
A backend solution that transforms SQL databases into a no-code, API-driven CMS for managing data, content, and user access with ease
Directus offers a unique, unopinionated approach to managing SQL databases, allowing users to retain their custom schemas while benefiting from a no-code data studio and robust API support through REST, GraphQL, and WebSocket. With role-based access control and real-time updates, Directus adapts to complex project needs while ensuring a highly customizable experience.
A customizable identity infrastructure designed to streamline authentication and authorization for applications of any size
Zitadel is a powerful identity management platform that simplifies authentication and authorization processes across applications. It supports various modern authentication methods, including Single Sign-On (SSO), social logins, and passwordless authentication, while offering a customizable hosted login page and robust APIs for seamless integration.
An open-source alternative to Firebase with SQL database and full backend support