Fix my v0 app
v0 is genuinely great at one thing: generating clean, working frontend UI fast. It was never meant to build your database, authentication, or backend logic, so most v0 apps that stall are stuck exactly there, a polished interface sitting on mock data or nothing at all. We don't touch the design work, it's usually good. We audit what backend actually exists versus what only looks like it exists, design a real data layer and auth system, and wire the frontend you already have to it. Rapid Diagnostic starts at $1,500, credited toward the full audit if you go ahead.
What specifically breaks in a v0 app?
v0's gap is structural, not a bug: it's a UI generator, and the app needs more than UI.
A frontend with nothing real behind it
Forms submit, buttons click, and the interface looks finished, but there's often no real API or database receiving that data on the other end.
No real authentication layer
Login screens exist visually, but session management, password security, and role-based access are usually not implemented underneath.
Mock data mistaken for real data
Sample data used to demo the UI sometimes stays in place, so the app looks functional in a way it isn't yet with real, changing data.
No business logic layer
Anything conditional, like pricing rules, permissions, or workflow states, needs to be built as real backend logic, not assumed from the UI's appearance.
How do you wire a v0 app into a real app?
We build the layer underneath the interface, not a new interface.
1. Audit what actually exists
We check whether your data layer, auth, and business logic are real, partial, or entirely mocked behind the v0 interface.
2. Design the real backend
We design a proper database schema, API layer, and authentication system to sit behind the UI you already have.
3. Wire the frontend to it
We connect the existing v0 components to the real backend without a visual rewrite, preserving the design work already done.
4. Harden and deploy
We add validation, error handling, and monitoring, then deploy to production infrastructure.
What does it cost to add a backend to a v0 app?
Since the UI is usually already solid, cost tracks the complexity of the backend you need.
A clear map of what's real versus mocked, and what needs to be built.
Real data layer, auth, business logic, wired into the frontend you already have.
Complex integrations, multi-tenant architecture, or ongoing engineering as your team.
v0 rescue questions
Why doesn't my v0 app actually save or load real data?
v0 is a frontend and UI generation tool. It's excellent at producing clean, working interface code, but it doesn't build your database, authentication, or business logic for you. Many v0 apps ship with mock data standing in for a real backend.
Is v0 a bad tool to start with?
No, it's one of the fastest ways to get a genuinely good-looking interface. The issue is only when founders assume the UI being done means the app is done. It's a frontend layer that still needs a backend behind it.
Will you rebuild my UI?
Generally no. v0 output is usually solid design work, and we build the missing backend to connect to it rather than redoing the interface.
What backend do you use?
We choose the stack based on your requirements and existing tooling rather than pushing a default. What matters is a real database, real auth, and logic that's actually tested, not a specific brand of backend.
How much does it cost to add a backend to a v0 app?
A Rapid Diagnostic is $1,500, delivered async, and the fee is credited toward the full audit if you go ahead. A fixed-scope diagnostic audit starts at $7,500. Building out the backend, auth, and data layer typically runs $50,000 to $150,000 depending on complexity.
Related reading
Rescue by tool
See every AI coding tool we rescue apps from.
Bolt.new rescue
Another prototype-first tool that needs a real backend built.
Finish the build
Our service for taking an unfinished app to a real launch.
State of vibe-code security
The research behind why AI-built apps need a real backend audit.
Send us the repo. We'll tell you the truth about it.
A senior engineer reads your actual v0 project and tells you exactly what's real and what's missing.