Outseta and Memberstack are both popular tools for adding membership and user authentication functionality to Webflow, but they differ significantly in features, limitations, and underlying philosophy.
Authentication & User Management
Both tools offer member login/signup and gated content.
Outseta uses popup modals and basic embed scripts; Memberstack provides more customizable login/signup UI elements and better integration control inside the Designer.
Payments
Outseta includes its own Stripe-powered subscription billing with more complex plan management (e.g., metered billing, prorating, B2B plans).
Memberstack supports Stripe as well but is currently limited to standard one-time or recurring payments per user.
CRM & Email
Outseta includes a CRM and email drip tools for user acquisition, onboarding, and lifecycle communication.
Memberstack offers no native CRM or email, so you’ll need tools like Mailchimp, Zapier, or HubSpot.
API & Developer Access
Both have APIs and Webhooks, but Memberstack’s API is more front-end friendly, especially for power users customizing user dashboards with real-time updates.
Outseta is more backend-focused, better for handling SaaS-like data management.
Webflow Designer Compatibility
Memberstack is more tightly integrated with Webflow’s visual UI, supporting styling of Signup/Login modals directly in Designer.
Outseta’s UI components are less customizable, relying on iFrame-style modals and limited styling override.
Speed of Implementation
Memberstack offers faster deployment if you only need user auth and gated content.
Outseta requires more configuration up front but provides a broader set of tools once set up.
SSO and Complex Auth
Memberstack does not yet support SSO or multi-tenant authentication.
Outseta also does not support SSO but supports B2B use cases better due to built-in account hierarchies and team-based subscriptions.
Use Memberstack if:
You want more control over the frontend UI.
You're building a content-driven membership site like eLearning, SaaS MVP, or gated resources.
You don't need an integrated CRM or help desk.
Use Outseta if:
You are building a SaaS product and need payments + CRM + email + support in one tool.
You want fast backend infrastructure without cobbling together multiple tools.
Memberstack is ideal for visually rich, content-first Webflow sites needing custom authentication and gated content with flexibility in design. Outseta wins if you're launching a SaaS and want a unified backend stack that includes CRM, help desk, and billing. Choose based on whether your main priority is frontend control (Memberstack) or backend operations (Outseta).