For a customer-facing dashboard with login, workflows, and custom branding, you usually want one of these three approaches:

1) Build on a dashboard/web app framework

Best if you want flexibility and a polished product.

Good options:

• React / Next.js with a component library like:
  • MUI
  • Chakra UI
  • Ant Design
• Add auth with:
  • Auth0
  • Clerk
  • Supabase Auth
  • Firebase Auth

Why this fits:

• Full control over branding
• Easy to build custom workflows
• Strong for customer portals, SaaS dashboards, internal/external apps

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2) Use a low-code app builder

Best if you want to launch faster and workflows are moderately complex.

Good options:

• Retool (better for internal tools, but can be used in some customer scenarios)
• ToolJet
• Appsmith
• Bubble (more customer-facing-friendly)

Why this fits:

• Faster to build
• Built-in auth and UI building
• Good for CRUD-style workflows

Tradeoff:

• Less control than custom code
• Branding and UX can be harder to perfect

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3) Use a customer portal / B2B SaaS platform

Best if the main need is a branded client portal with secure access.

Good options:

• Softr
• Framer + auth layer
• Bubble
• Supabase + Next.js if you want a more modern custom portal

Why this fits:

• Good for external users
• Quicker to implement login and permissions
• Can support white-labeling/custom domains

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My practical recommendation

If you want the best mix of custom branding, workflows, and a real product feel, I’d recommend:

Next.js + Tailwind or MUI + Auth0/Clerk + Supabase/Postgres

That stack gives you:

• Custom login and user roles
• Fully branded UI
• Flexible workflows
• Scalability for a real customer portal

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If you want the fastest path

Choose Bubble if:

• You want to ship quickly
• You need custom branding
• Workflows are important
• You don’t need deep frontend engineering control

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If you want a serious long-term product

Choose Next.js + a backend/auth service if:

• You expect the dashboard to grow
• You need complex permissions/workflows
• You want a premium branded experience

If you want, I can also recommend the best stack based on your budget, team size, and whether this is B2B or B2C.