What are some alternative approaches to implementing user authentication on Webflow sites without relying on Firebase UI, and why is this beneficial for customizing the login and signup forms?

Webflow doesn't support native user authentication, so integrating external tools is required. Using alternatives to Firebase UI offers greater styling flexibility and control, which is essential for custom-branded user experiences.

1. Use Firebase Authentication with Custom UI

• Use Firebase's back-end services, but build your own login/signup forms in Webflow using custom HTML embeds with JavaScript.
• You can then connect those inputs to Firebase using the Firebase JS SDK.
• This eliminates the rigid default Firebase UI and allows you to fully style and position elements within Webflow.
• Benefits: Seamless brand integration, total UI design freedom, and control over form interactivity.

2. Use Memberstack

• Memberstack is a no-code tool that integrates directly with Webflow and handles user signup, login, gating, and even subscriptions.
• You can fully customize login/signup modals or pages to match your Webflow design.
• Benefits: Visual setup, fast integration, fully customizable forms, and supports gated content/pages.

3. Use Outseta

• Outseta offers user authentication plus CRM, email marketing, and subscription management.
• It integrates with Webflow via lightweight JavaScript snippets and UI elements can be custom-styled via CSS to match your design.
• Great for startups looking for all-in-one solutions.
• Benefits: Unified platform, customizable styles, and minimal backend setup.

4. Use Auth0 with a Custom UI

• Auth0 is a powerful BaaS (Backend as a Service) for authentication and authorization.
• You can build your own login/signup forms in Webflow and handle the submission via Auth0’s authentication API.
• Requires more technical setup but allows enterprise-level security and full UI customization.
• Benefits: High security, flexible roles/permissions, and total UI freedom.

5. Use Wized + Xano

• Wized is a front-end logic layer for Webflow, and Xano is a no-code backend.
• This combo allows you to manage user authentication via REST APIs, while designing totally custom UI in Webflow.
• Benefits: No templates—100% design control, robust authentication with custom logic, and scalable backend architecture.

Summary

Avoiding Firebase UI and choosing tools like Memberstack, Wized + Xano, or custom Firebase with JS SDK gives you full control over the design and behavior of your login/signup forms in Webflow. This enhances brand consistency and creates tailored user experiences not possible with default Firebase UI templates.