InstantDB vs Supabase RLS Leak Demo
Side-by-side comparison of features, pros & cons, pricing, and community votes (2026).
🏆 InstantDB leads with 0 upvotes
Complete backend with auth and storage in one prompt
InstantDB is an innovative open-source platform that transforms AI into a comprehensive full-stack app builder. Designed for developers and entrepreneurs, it simplifies the process of creating robust web applications by integrating essential backend features such as authentication, permissions, storage, presence, and real-time streams—all within a single prompt. Its ease of use is highlighted by the simple command `npx create-instant-app`, enabling quick setup for both hobby projects and production-ready apps. InstantDB's unique selling point is its ability to combine powerful backend functionalities with minimal configuration, making it accessible for users of varying skill levels. Whether you're prototyping or deploying full-scale applications, InstantDB offers a versatile and efficient solution that accelerates development cycles while maintaining flexibility and control.
Pros
- Open source and free to use, encouraging community collaboration and customization
- All-in-one backend solution with auth, storage, permissions, and real-time features
- Easy setup with a single command, suitable for rapid prototyping and production
- Works well for both vibe coding and deploying full apps
- Flexible and adaptable for various project scales
Cons
- Limited information on advanced scalability and enterprise features
- Potential learning curve for users unfamiliar with full-stack development
- No detailed pricing or support plans available, as it is open source
Best for
- • Building quick prototype MVPs for startups
- • Creating real-time chat or collaboration apps
- • Developing internal tools and dashboards
- • Educational projects for learning full-stack development
Pricing: InstantDB is open source and free to use, making it accessible for individual developers and small teams. No paid plans are explicitly mentioned, although enterprise or larger-scale deployments may require self-managed hosting or custom support arrangements.
Reproduce a cross-tenant RLS leak and verify the fix
Supabase RLS Leak Demo is a focused, open-source testing tool designed for developers and founders working on multi-tenant applications. It provides a simple yet powerful fixture to simulate a cross-tenant Row-Level Security (RLS) leak in PostgreSQL, allowing users to verify whether their security policies are truly effective. By running a straightforward test suite with commands like 'npm ci && npm test', users can identify potential leaks and confirm their fixes—no need for Docker, cloud credentials, or production data. This makes it an excellent resource for teams committed to security and data integrity in multi-tenant SaaS platforms. The tool's unique value lies in its ability to demonstrate that a policy may appear correct but still harbor vulnerabilities, offering clear evidence before deploying to production.
Pros
- Simple setup with zero dependencies on Docker or cloud credentials
- Open-source and easy to run locally for immediate security testing
- Provides clear, reproducible evidence of security leaks and fixes
- Designed specifically for multi-tenant SaaS applications
- Helps teams validate security policies before deployment
Cons
- Limited to PostgreSQL and Supabase environments
- Primarily focused on RLS leak testing, not a comprehensive security suite
- Requires familiarity with SQL policies and testing practices
Best for
- • Testing and verifying multi-tenant data security policies
- • Demonstrating RLS vulnerabilities during security audits
- • Validating fixes for RLS leaks before production deployment
- • Educational tool for developers learning about RLS security
Pricing: Open source and free to use, with no costs involved. It is designed as a lightweight fixture for local testing and validation.