A multi-tenant SaaS starter with adversarial tests
About B2B-Saas-OS
B2B SaaS OS is a Next.js 16, Supabase/PostgreSQL and Stripe foundation for developers building multi-tenant B2B SaaS applications. It includes authentication, organizations, role-based access control, team invitations, API keys, billing, usage limits and audit logs. Its adversarial hardening suite tests tenant isolation, privilege boundaries and Stripe webhook failure modes—and caught three real bugs in our own application that we fixed.
PlatformsWeb, API
✓ VerifiedOct 9, 2026
Key features
- Multi-tenant architecture with PostgreSQL RLS
- Role-based access control (RBAC)
- Authentication and OAuth
- Organization and team invitations
- Stripe billing and webhook handling
- API keys and usage limits
- Audit logs and feature flags
- Adversarial hardening tests for security and reliability
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