Authgear ONCE
Open-source authentication platform for developers — add login, signup, and user management to your apps
| What is it | Open-source authentication platform for developers — add login, signup, and user management to your apps |
|---|---|
| Pricing | Freemium |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Best for | Adding login functionality to applications, Managing user authentication systems |
| Domain registered | 2020 |
Data updated Aug. 1, 2026
What does Authgear ONCE do?
Authgear ONCE is an open-source authentication platform designed to help developers implement secure login and user management systems for their applications. The service provides the infrastructure needed to handle user authentication, signup flows, and account management without requiring teams to build these complex systems from scratch. It handles the security aspects of user authentication while giving developers control over the user experience. The platform operates as a web-based service that integrates with existing applications through API connections. What makes Authgear ONCE stand out is its open-source nature combined with a generous free tier that supports unlimited monthly active users. While the free version includes Authgear branding, the platform offers enterprise options with custom support, service level agreements, and compliance features for organizations with specific requirements. The service is built with transparency in mind, allowing developers to understand and customize the authentication flow to match their application's needs. Authgear ONCE is particularly useful for development teams building web or mobile applications that require user accounts. It saves significant development time by providing a ready-made authentication system that handles security best practices, password management, and user session handling. Companies looking to implement secure login systems without maintaining their own authentication infrastructure will find this tool valuable, especially when they need to meet specific compliance standards or scale their user base efficiently.
Key features
What makes it stand outWho is Authgear ONCE for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardAuthgear.com
- Authgear branding
- Unlimited MAUs
Trust & presence
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