How does row-level security prevent tenant data leaks?

Every row in tenant tables has a workspace_id. Postgres RLS policies check that the requesting user belongs to that workspace before returning the row. Even a SQL injection that bypasses your application layer can't cross tenants because the database refuses.

How does the invite flow work?

Owner enters an email + role, an invite row is created with a one-time token. Email goes out via Resend with the accept link. Clicking it auths via Supabase, joins the workspace, deletes the invite. If the email already has an account, they auto-join on next login.

Can a single user belong to multiple workspaces?

Yes. The user-workspace relationship is many-to-many with a role per pair. The UI shows a workspace switcher in the top bar; switching changes the active workspace and the data shown. Standard B2B SaaS pattern.

How does billing per workspace work?

Each workspace owns its own Stripe Customer ID and subscription. The owner pays. Member seats may add per-seat charges via Stripe metered if your pricing scales by team size. Webtwizz scaffolds either flat-fee or seat-based.

Build a Multi-Tenant SaaS with AI

Workspaces, members, roles, billing per tenant. Skip the Clerk/Auth0 per-MAU tax for the auth layer alone.

Webtwizz AI Full-Stack Builder Interface Preview

Free Supabase MAU before paid auth

Workspaces + roles + invites wired

Tenant data isolation via RLS

Per-MAU vendor fees

01 / What you get

Multi-Tenant SaaS, generated.

Click Generate from the box above. Real Next.js code, real database, real integrations - not a sandbox. Each piece below ships in the first prompt.

Workspaces (tenants) with their own data, members, settings

Role-based permissions: owner / admin / member / viewer per workspace

Invite flow: email invite, accept link, auto-add to workspace

Stripe billing per workspace (not per user) with seat-based pricing optional

Row-level security in Postgres so tenant A never reads tenant B's data

The same shape becomes

3 variants you can ship.

B2B SaaS workspace

Teams, projects, shared data. Standard "Notion / Linear" shape.

Agency client portal

Each client is a tenant; agency is super-admin across all tenants.

White-label SaaS

Each tenant gets their own branding, subdomain, custom email templates.

Pixel-perfect control over every detail

Fine-tune typography, colors, spacing, and layouts with precision. See changes instantly as you design.

Built-in content and data

Manage your content directly in the builder, or connect a database for dynamic data like products, blog posts, and user accounts. No technical setup needed.

AI that actually builds

Describe what you want and watch it come to life. The AI creates pages, adds features, fixes issues, and refines your app through natural conversation.

Layers panel

See your entire page structure at a glance. Select, reorder, and nest elements with drag and drop precision.

Custom components

Build once, reuse everywhere. Create your own components and drop them into any page instantly.

Pages panel

Manage all your pages in one place. Add, duplicate, and organize your site structure effortlessly.

For people who hate $99-per-seat tools.

→B2B SaaS builders shipping team-shaped products

→Internal-tool platforms multi-tenanted to clients

→Agencies productising their service into a SaaS

Powerful integrations

Payments, database, AI, email, analytics. Wired up the moment you click connect.

Stripe

Payments

Supabase

Database & Auth

OpenAI

AI · GPT

Anthropic

AI · Claude

Resend

PostHog

Analytics

Sentry

Errors

Suggest an integration

Why generate it instead of buying it.

“

Clerk and Auth0 charge per MAU. Past 10K active users that's thousands a month for auth. Supabase Auth is free up to 50K MAU and self-hostable; Webtwizz scaffolds everything around it.

“

Multi-tenant security is one of the easiest things to get wrong. Postgres row-level security is the right tool; Webtwizz writes the policies based on the prompt instead of you authoring them by hand.

Head-to-heads: vs Lovable · vs Bolt · vs v0 · vs Replit

Frequently Asked Questions

More saas apps you can ship.

SaaS with Subscription Billing

Login, Stripe Checkout, plan limits, customer portal - the four pieces every paid SaaS needs, generated and wired up. Skip the boilerplate, ship the actual product.

Admin Panel

The internal tool every SaaS eventually builds. Generate it instead of paying Retool per seat or stitching it from scratch in your free time.